No matter how much a gambler spends in gambling it should be what the gambler can afford to lose. It is when a gambler is spending more than what they can afford to lose that's when it becomes an issues There is no gambler that goes into gambling with the mindset of losing no matter how small the amount they are using to gamble is . however they should always understand that in gambling is either you win or you lose.
You are right and I agree with you that there should not be any budget limit/idea and that can only be those amounts for both rich/poor people which they can afford if they lose. Winning can't be expected, though there might be more winning than expected.