Honestly there are a lot of animals that have become very difficult to keep up with from a breeding standpoint. Hyenas, Giant Pandas, there just aren't enough on the market anymore. People, including puppy mill people, aren't playing as much I guess.
That being said, I've never understood the whole puppy mill thing. I have 1.5m cc .. and I haven't had more than 2 enclosures for an animal. I don't even do that anymore, I just have 1 of each now. cc is pretty easy for the most part. And i've inbred some of the faster breeders by accident, but only 3-4 times since launch. There's just no need. I mean I guess if your enjoyment is to have 10m cc .. but what's the point in that?
The whole resale thing .. I get, but it's the same in world of warcraft and most mmo economies. Ive done a little of that here but it mostly comes down to feeling the need to buy before comparing mates because I know someone else will and I don't keep track of what I bought cheap or didn't so a lot of times they get reposted for a lot higher. To me though people should be researching the market value of their animals before posting them. Posting something good at 10% it's worth just means those of us that breed animals have to buy it to inspect it. Maybe it's helping the little guy, but, the only way the little guy is going to contribute to the animal population in the long run is to learn to breed from the ground up, with bronze or silver guys. I still see plenty of breeds that post cheap. Nyala is one, they are fun to breed to. I stack them in my storage and keep comparing the new females to the new male until the last moment when I have to cycle out the 5 in the zoo. I can't remember the last time I got a silver nyala.