Because, if we are not a gambler with a lot of money, there's no reason in chasing these bonuses. We might feel this is unfair, but almost all bonus models come with "terms and conditions." If we feel can't meet the TnC, just let it go. Even if we are losing that bonuses, it's not a loss for us.
The bonuses aren't our money hence why should we be angry that we aren't participating in them. Bonuses are there as additional bonus to we the gamblers but when you're lucky, you'd don't need that bonus to win hence it isn't that important. There are some bonuses that are very good but that shouldn't make us want to cheat the casino because of the bonuses that they're offering. Anything we're doing, we should be aware that it won't stay hidden for ever and it takes one mistake for everything to be revealed. Don't cheat casino instead try to open accounts on different casino and gamble on multiple casino so that you can be getting the bonuses if that's what you're after.