Not really.
As I mentioned above, I did sell a couple of prints and the promised profit did get delivered to me. I didn't have to print, measure, cut, mount, frame, pack, and ship any of my photographs. And most importantly, I get to shoot what I like and I can process it the way I envisioned it.
Stock photo agencies are more ruthless (in my view). Years ago I tried to enter istockphoto and one more (the name escaped me at the moment).
I wasn't able to get anything that I like past their stringent scrutiny. The ones that did got in ended up looking like what *they* like, really no different than thousands other stock photos out there. I don't blame them, those are the types that sells. Unfortunately for me (not speaking for anyone else), that's not what I want to shoot.