Judging from this and many other lists - not very! I think you have been extremely lucky with the one you had.
Don't worry about that - there are no rules with these matters other than do what makes you happy.I also wonder, since like you I also want to remain being the 'powerhouse' and leave BDSM purely to the sexual side of the relationship, if searching for somebody within the BDSM community is the wrong way to go about it. My impression (very uneducated so feel free to inform me!) is that most people in this community consider BDSM to be a whole way of life that affects all areas of life and doesn't just have an on/off switch so you can have a little BDSM fun when time allows for it.
Maybe the same people, but not the same choices. But a M's relationship is only one of many many ways, and even within M's relationships there are many ways!You are talking of finding a master and I'm talking about finding a partner, an equal, but who will dominate me sexually. I may be wrong but I don't think they're the same people? All the same, to anyone else that has read this post I'd also like advice please!!
Do not worry, you can find your opposite number, and here too. Just be clear about what you want, and what you can give.