Prey -- Am I nuts?

So, I ordered a copy of Prey (new, PC version) off Ebay a few days ago for about 6 bucks.  You might ask "What the fuck?"  Well, the reason is because Steam decided to delete the game from their service (to buy, specifically), since they ran out of CD Keys during their Christmas sale from 2009.  Since then the title has been unavailable for purchase from Steam, with them later quietly removing the store page altogether.
 
However, you could previously buy the game from GamersGate, get the cd key, plug it into Steam, and add the cd key into your Steam games list.  But, GG took the game down also.  There's a few other sites that let you buy a digital copy (Gamestop has it for 20$, and some British site had it for 10 pounds), but it's still kind of insane.
 
So, I bought a new (hopefully) copy of the 2 CD version of Prey off Ebay, JUST to get it's cd key to plug it into Steam, so it's added to my games list.  That is officially going off the deep end, I imagine, for the sake of my Steam account.  Especially since the game is 4$ from Gamestop, for the 360.
 
The final thing is, I like Prey's idea's, some of the weapons/ship is cool, and I think the beginning 10 minutes are amazing, but that's about it.