I hope you and others keep exploring this. There was a shift in the hobby about 20 years ago, when people stopped breeding their own fish and became consumers. In our local fish club, there would be all kinds of weird things in the auction.
I think this is largely the result of the internet, and lack of real life social group/nerd interest meetings. I'm a member of the tropical fish club in my area that has meetings quarterly, but my social shyness has stopped me from attending one (yet), and a lot of the "getting to know" and trading seems to happen more as pre-arranged swaps from online groups now. Many newer people to the hobby won't even know of the days of weekly meets at their LFS, because they don't have many LFS left... only chain stores that don't have passionate hobbyists running them, and even if they do, they have to keep busy and not spend their time chatting with customers and networking.
I do much prefer and find more interesting things when talking with and trading with other hobbyists though! When I was getting overstocked with pygmy cories and started looking to home some groups of juveniles, I did some plain swaps, where for 6-8 pygmies, he gave me three
P.luminatus and some buce and other plant trimmings from a hobbyist who like you said, just likes to grow plants and breed fish for the passion of it. That also got me into keeping the idea of keeping dwarf rainbowfish, and might not have occurred to me without seeing and having those three to begin with!
I did want to try to breed them, but was always too busy to set up a spawning tank, and any eggs would have been eaten by adults and tankmates, but I still want to get more and give it a real go. I deliberately bred livebearers to start, loved that for a couple of years, and then took ages to wind it down. Then bred cories - accidentally! Wasn't expecting my bronzes to spawn, or my pygmies to just colony breed in the tank, but both were wonderful surprises, and raising several batches of aeneus cory fry, and being more successful with each batch as I got the hang of it and learned more, was really enjoyable, and makes me want to intentionally breed some egg scatterers next!
Want some more I.kerri most urgently, so need to check my M/F ratio and read up on conditioning and spawning them.
SF says they're pretty easy to breed... so hopefully!