I don't know if this was purposely implemented by someone, however I just played a regular game of booty grab I got 5,000G, I went back to the homepage, clicked on the mp, and my G amount was 500,000,000G.
Without Java Script or anything, I was able to buy things as well.
EDIT: Got banned :/
Gaia admin refused to deduct the gold instead of banning me, what BS