I agree with the others, raising the price limit certainly isn't the way to go here. More like cap it even more for different levels (IIRC I think OP even suggested something along those lines as well) like basic animals can be sold up to 2.5k, bronze 5k, silver 7.5k and gold up to 10k. That way there'd be a certain guaranty that more expensive animals are actually higher quality as well, while players would still be allowed to sell good ones for cheap. Another way would be to set a range for each level: basic 0-2.5k, bronze 2.5k-5k...though I'm not sure if I'd actually like that kind of limitation to the market.
Either way I'd prefer if they found another way to implement more CC sinks, like being able to buy more space in the trade center or transfer research to a new zoo. They could even make it more expensive to open a new zoo. I mean right now every zoo is 100cc which is nothing, really. It'd be better if each new zoo was more expensive than the last, maybe twice as much going from 100 to 200 to 400 and so on.
So yeah, whatever they do I hope they won't raise the limit. And if you really wanna spend some cc you can start doing give aways like I've seen some people do already or you can do what I do as well (I got close to 2mil cc now as well) and just breed good animals especially the popular ones and sell them for cheap to help others out who don't have that much cc yet.