A few years ago, in one of the Blizzard offices...
Programmer A: Ok, and I think I'll assign a 64 bit integer for the money...
Programmer B: 64? I am sure a 32bit one will be more than enough.
Programmer A: Well, that would give us a cap of about 200.000 gold... do you think it will be enough?
Programmer B: Of course it will! Do you think that there will be anyone out there willing to farm more than 200.000 gold?
Programmer A: Yeah, you are right...
Present day...
Programmer A: Hm... what? Hey, come check this out!
Programmer B: What is it... oh... ugh... hehe... Hahaha!
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On a completely unrelated note, I always thought that a Chinese would have reached the cap first.