That happened to me Aleph. I had to drop a casino I always earned over $10,000 a month with because they carry forward negative balances and I supposedly had two whales who racked up over $1 million dollars in negative balances.
Did the whales exist or did they decide it was cheaper to manufacture these rogues and lose any future business I would be bringing them?
I was never sure.
Negative carry forwards could be abused by the casino if they so wished to seize a large exisiting player base.