Here's the basic rules:

You can only place a world on the Marketplace that you own.
You can set the desired value in credits and/or artifacts. You would be able to select from all tradable artifacts and enter a desired purchase quantity.
When a pilot purchases the planet from you, it self-purges itself from *your* database while copying itself to the new owner. It does not purge from other ships' logs.
The buyer has to pay a tax on it, just like buying/selling minerals. Example... you post a rock for 10,000 credits. Somebody buys it, they pay 10K, but you only recieve 8K.
Colonization cost is included, at 1.5x base rate instead of 2x for invasions.
Planets cannot be invaded through the Marketplace
and the big one... there is a 6-hour clock countdown from the time you post it before it's actually available to buy. This is a multi-account countermeasure.

+1

But I think you should only be able to post 1 planet per 24hrs.

Most of the planets for sale at planets not owned by the seller. How will the 6 hour difference prvent multi from buying the planet.

sounds good but needs a proviso that the planets put up are better than average size and better than abundant resource, otherwise the place will fill up with all the rubbish nobody wants

"Most of the planets for sale at planets not owned by the seller. How will the 6 hour difference prvent multi from buying the planet."

Well it wouldn't, not directly. But they have to take in consideration that somebody else is waiting for that timer to tick over. No cheap instant-trades of a Dyson from a sensor mule, for example.

"sounds good but needs a proviso that the planets put up are better than average size and better than abundant resource, otherwise the place will fill up with all the rubbish nobody wants"

Howabout a time limit instead, say 48 hours, then it falls off the market. Should save the values that you had it priced at though, or it could be a hassle.

Just call it GL-bay...

Anyway... I like the idea in general, needs some tweaking but not sure what exactly.

The yellow part sounds like the seller pays the taxes... If I'm selling something for 10K, I want 10K not 8K...

It's how the AH in Warcraft works, so my brain kindof shifted in that mode. With the AH cut and all that.

anybody here played guild wars?
in every major town there were computer controlled merchants buying at one price selling at another...and people spamming the chat channels with prices in between the 'market' prices.
that worked well if you wanted something at the same time somebody else was selling...otherwise you had to use the npc merch

I wish I could put em on market, I got dozens of planets I would sell but the 2/day limit is painful. After 1800 purger missions, I got excess inventory. I find em faster than I can colonize heh.

geez 1800 purger missions. Looks like I need to start trading for some exotic matter.

http://biometallicfusion.com/GL/trade.php (partial list, I have better/cheaper) -- I price in kurenite and exotic, and most people pay exotic which lets me rank more (in fact it's the only limiting factor, I could +200 ranks right now if I had like 2.5-3 million exotic) and get more purgers. It feeds back into itself. When ppl actually pay kurenite, then I use it to colonize some myself (it's expensive like 3B now to colonize). I have pretty standardized pricing based on raw resource potential, higher being rarer , of the form (size*richness)^2 . Exotics are auctioned, depending, but I only found 3 so far.

I have a theory because I got them all right after universe planets adds +50000 or something, that the new ones have to get allocated, it could just have been luck. Looking at my new terras, I'm getting stuff with planetid 600,000-something and 900,000+ (newer planets) for the most part, the higher ones seem less saturated. I am almost certain it does not just pick a random planet number from 1 to # of planets in the universe.

We do really need a formal market system for selling planets, or a faster timer on it. But I'm biased

OK , I've updated http://biometallicfusion.com/GL/trade.php , with half prices. I can also list people's offers too. Maybe we can make something good out of it ? I'm welcome to ideas for listing format. Maybe auction style as well.

agreed, the buyer should pay the tax, not the seller. (add the tax on in creds? e.g 10% of the cost added on)

I like the idea where one can put up stuff for sale on the market where anyone can buy from anyone.

I used to play eve long ago, you could buy and sell stuff thru market there wether you are logged in or not.

Although I'd like to have lots of sharing, even with the normal 12h timer, just being able to increase the scope of my share in a sense, and have a standing order, would do a lot for my ability to sell planets. I think for this to work, the planet attributes (but not name) need to be listed when you select a planet to sell, you can set a fixed credit price or auction style (yeah, ebay is a decent template here), unoccupied planets in your list only; when a purchase is made (or auction finished), the buyer gets the planet added to their list, the seller has it removed from their list, and any seller planet shares on it are expired (mostly for security of it). This is what most people do anyway, and the 10% tax would be assessed (most places still do tax the seller though, for listing. Again, see ebay). Note since this is effectively a "Scan transfer", the buyer still needs to colonize at normal cost.