Stackoverflow does have a bounty system . you can only pay with your fake points though , allowing ppl to pay with real cash is ripe for abuse.Their points econ

Stackoverflow does have a bounty system . you can only pay with your fake points though , allowing ppl to pay with real cash is ripe for abuse.Their points economy is very carefully built, just like any successful in game economy, hyperinflation is major problem is a problem all of them have to worry about.