I feel like most people in this thread aren't understanding thoroughly that this game is telling you all that money is worth less every year incrementally, I wonder how long this can go on.
Inflation is hard to stop, and you probably wouldn't want to. Meanwhile, they aren't making more crude oil. So, it's definitely going to be more money for less gas as time passes.
On the other hand, if they made a game where you held down a button to buy a certain amount of teraflops, it would probably go the opposite direction over time!