First, I'm the type of person who believes most people who don't choose to be single are lonely. Largely because I can explain the evolutionary psychology, biology and chemistry behind it...and I watch people. Now, a question to bare the human we try to be.
Have you ever engaged in a vanilla relationship knowing your partner was vanilla? Did you do this to keep away the ghosts of lonliness? Did this interfere and even oppress your kinky side? Was the sacrifice worth it? Would you call it a sacrifice or compromise? And most importantly, are you happy?
I'm also the type of person where I won't engage in a vanilla relationship knowing the other party is vanilla. This is largely because I believe in creating and forging happiness with the right person. Time is too little to spend it with someone who doesn't have a real chance with making it last. Some of commented I ask too much, but I think happiness is one of those things shouldn't be something you barter with. Familial obligations is an exception in my book, but that's another topic.
Cheers.