I'm contemplating on selling some, just not sure if it's worth it.

I know it cannot be sent, therefore invasion or colonizing planets then using the Quasi Spacial Expander on the planet then abandoning it or allowing you to invade it back is the method I'm using to sell them.

How much would one be willing to pay for that in CTP?

They usually sell for 3-4k

In the land of Eots we pay 2000 - 2500
2 Qse and a transfuser used on the planet + abandon you could get 8000 - 9000

I'm interested if you like my prices.

And what if the transfuser doesn't generate an event to your liking?

Doesn't matter to me.
I'm paying for the transfuser and not the effect.

Hmmm never bought a reality transfuser before. Are they sendable? Or do I have to use them on the planet before abandoning or letting the buyer invade again?

Not sendable.
Same concept as selling QSE and if you're gonna sell those you might as well sell both to make more ctp per 12 hour abandon/alert
You can use the transfuser on the planet and leave the analyze to the person paying for it.

I left an alerted planet with the This planet has an analyze available button just to annoy legionmates.