I've made probably 7 or 8 in my lifetime and I've never got paid. I've lost quad kings to a royal flush though.
In fact, Royal Flushes are terrible for making money. Either 1 of 2 things happens
1) You bet really small because you're scared your opponent will fold and you thus get less value from them
2) You bet for value and your opponents fold because lets be honest, what are they likely to call you with when it hits?
You need a serious cooler in your favour to make anything, and even then you hope your opponent is more than 100bb deep.
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