rank 412, x= 84.9 M
rank 635, x= 201.9 M

need more datapoints... anyone else?

Well, it would be kind of ridiculous to revoke a post I made many months ago. Back then I was going on what seemed most obvious, I did some basic math and it seemed similar to the credit reward I was getting at my low rank at the time.

so this game has a 20% chance of getting something worthwhile and 80% chance of getting crap. (10% for 5 rank points and 10% for 20 GP) I think we need better odds or atleast different prices,

My suggestion would be maybe this
10 slots
1 5x Rank points
2 20 GP
3 4 hours of minerals
4 4 hours of reserch
5 Large credit value
6 Random artifact pull (ANY artifact inculding mission onlys)
7 Trapped up (your ship and ALL planets gain ALL traps applicatable in the game)
8 energy cube
9 4 hours of artifact point production
10, Full artifact/reserch/Mining. (it fills whatever your cap is)