I doubt there is a single one of us here that enjoy losing bets or money right ? if you do , I think you have some problems or you're mega rich and you don't care about money but 99% of gamblers really don't enjoy when they lose money as most of them are gambling to become rich and they are afraid to admit it and that is the first sign of addiction. For me , when I have a losing streak , I stop betting and maybe after 2-3 weeks I will try another random bet to see if I'm still in the same situation or my inspiration and luck are back. 
Of course, no gambler can accept defeat even though they have set a budget limit for gambling and especially if you experience consecutive losses until your budget runs out from gambling, then your opinion is correct that 99.9% of gamblers do not accept defeat and their goal is to increase additional income from gambling even though they claim to gamble for fun.I think if you really take part in gambling for fun then don't gamble too often because it has the potential to trigger the initial effects of addiction which will increase the budget for gambling, so gamble according to the minimum budget limit and if you lose then never use another budget and gamble on another day so that you don't experience big losses.