I tried playing Final Fantasy XI on a private server for a week, but found the game to involve too much grinding. Then I noticed an SQL injection in their aucti

I tried playing Final Fantasy XI on a private server for a week, but found the game to involve too much grinding. Then I noticed an SQL injection in their auction house web page, which allowed me to dump prices of items at various times and build a private API. I used this to inform my investment, got quite wealthy and bought equipment for my toon, then quit the game shortly after.