Well actually 1-2k would only get you somewhere like 5% extra though as 10% rollback rollbots cost alot more than that
It is one of the better site around and as a matter of fact that guy keep on playing on the site and currently have won a total of 55 btc already ( I read about this information in discord though )
Some people gets abit agitated when they won a shitload of money and whenever they cant get those withdrawals instantly then I guess thats became a problem for them. Its a huge amount of winning though so its kinda industry standard to double check those huge win to make sure that there is no fraud play on it