I always thought of Kincaid as greeting card art on steroids. Nothing to complain about, but it appeals to older women who are well off, and not particularly knowledgeable about art. I was somewhat surprised that anyone who could scrape together enough money and credit to open one of those galleries would be foolish enough to do so. They were probably very naive about the art world. I can't think of any artist, living or dead, that could support an entire chain of galleries dedicated only to one artist's work.
Not a darn thing wrong with that though. That's a market. A niche. He used his talent to make a fortune while he was alive. Very lucky and very smart. He choose the commercial route and I can't see anything cynical about that. Now if he is cheating his franchises that's different but that' his business side..not the art itself.