Yeah Alvar, you are right. But in most of servers ppl can gamble without any risk, when they come to LW, gamble, and then rejoin 2 days later with -2000000 in bank they cant even buy weps. Dunno the solution. Maybe the negative balance could be removed after a week or some, or just make a warning that will appear in a casinos, something like: Warning! The negative amount of your cash will not disappear even after rejoining the server.
Something like "Fighting disallowed!" in ammonation and bank.