I paid significantly more than $50;
A) I live in NZ, thus paid $99
B) before getting a decent computer, (June,) I had been playing at an internet cafe since August. I have no intention of finding out how much I spent there as I fear it will cripple me mentally.
Anyway, question aswered. Cost ($50 base) = how many cents you have spent per hour you have played, relying on the fact that you spent $50 on the game. A bit out of date I know with expansions, boosters and whathaveyou, but uh... interesting... I guess...