Thread:Thehammer2/@comment-22439-20131014003952/@comment-5645428-20131014063713

To this day, I don't think anyone has ever investigated XP requirements per level, so I've got nothing there.

Not sure about the listed retail prices, but if it says you can get everything for 150,000 Joules, that's indeed what you get it for! If I can recall right, you might not receive the Gernobyl, but that's arguably one of the worst weapons in the game, so you're at no loss.