A fellow GH guy here, my take on it.
For the most part GH has always been about water animals specifically beaver, otter and to a lesser extent mink. Price sucks on them now but it is what we have. I write off rats. You will get a few incidentally but tough to find anyplace with much of a population. We do have coons but right now practically unsaleable so I'm not fooling with them unless I get paid.
Bobcats are cool to trap and I would include them but we really have a poor cat so don't expect to do bank.
For me I have a niche market for civets so that is my main quarry.
You really have to be trapping for the love of it now so if I was starting out it would be beaver, otter, cats maybe mink.