Crap sells. Sure, I get that. I'm not going to argue, though I might question where you get the figures to say how much it sells (you know, the sort of inconvenient question that buyers of such crap forget to ask, like whether it has any basis in fact
).
What I'm missing is the link you made in the OP: "I'm thinking I'll be able to generate some interest in my novels with some short non-fiction ebooks." What makes you think that link exists? (For the sort of non-fiction you are considering.)
I'm also missing where the marketing skills required to make that stuff sell would be better placed on that stuff than it is on what you want to write.
I'm also missing any indication that you really want to write such stuff as anything other than a marketing tool for what you do want to write.
If you do want to write it, that's great, go ahead and do it. If it's just an attempt at marketing, then - before I spent too much time writing - I'd be looking for some more substantial evidence that the link you're looking for actually results in cross-over sales.
ETA: You might consider it as background research into another non-fiction project: what works and doesn't work in marketing self-published books. There seem to be some authors out there making more money from selling their "expertise" in self-publishing than they are from writing actual/original work of their own.