It could be related to how much cash the club has as a whole. If you are giving a club with £5m in cash £250k a week wages, the board might not allow this and give you £55k a week which is within their £5m cash reserves.
I've tried giving the club up to 1 billion, with a 300 million transfer fund... incidentally, when I set this, it allows the transfer fund, but not the overall funds....
Do I need to make the club PLC/Sugardaddy?