If you have just three pairs, I assume you are still gathering your broodstock. It takes serious resources to breed one line of fancy Bettas well, and the usual way to do it is to breed a few hundred young, raise them, choose the next generation and sell a bunch, then maybe put that strain on the backburner and attempt another.
Collecting pairs because you like them is as legit as breeding them, but how are you set up to run four strains as a breeder?
I knew a guy in eastern Canada who had a stand alone garage he could heat for breeding high end Bettas. He sold pairs he bred along with fish he imported. I haven't seen his fish for sale for a few years now and I think high energy costs and the amount of work took the pleasure out of what he was doing and he stopped. You'll have similar energy issues in Toronto. How are you set up to expand like that?
I don't linebreed fancies and the labels on them mean nothing to me, but I know hard work and space demands when I see them!