I can't remember who it was (I think it was Max Dillion) but they received a massive pay out of Vcash for no real reason. And passed it about amongst their friends before telling the admins.
And Blake, when he was being a complete tool before his banning, created a vbookie event with massive odds, betted on it and settled it winning himself billions. Not sure whether he passed it about much before he was banned though.
The glitch we can deal with as it's obvious. What's harder is vbookie staff opening events after they are decided, betting then settling them. This happened in the past. Times of bets are tracked through the database so it's not the perfect crime but some have got away with it...