While Oakland is indeed a dump - I think greed is the likely culprit here. Fisher wanted a new stadium and found a whore of a city that would pay him.
Well...yeah. I probably would've done the same thing in his situation.
I wouldn't necessarily call that greedy, though. There's a key difference between (unhealthy) greed and (healthy) self-interest. And it's this: how does the guy on the other side of the table come out?
Of course, that's a gross simplification. Everything entails risk. Just because somebody makes a bad business deal doesn't necessarily mean they got hosed by whoever they made it with. In other words, Las Vegas isn't guaranteed that forking over their taxpayers' money to woo an MLB team will return more than it cost. But greed, to me, is when you knowingly and willingly screw somebody else over for your own gain....either with or without their consent.
These sports teams are still, at the end of the day, businesses.