A few years ago when I could get $20-$35 for a skin I though they served a purpose. I got into small time trapping for a motivation to get out in the woods more often and wasn't really trying to make money but it was a nice motivation and way to payoff your equipment. The last year or so when they are essentially worthless they seem to have a lot more downsides. I agree with their nasty disposition and tendency to use the most unfortunate places as their toilet.
The problem with low fur prices it really reduces the number of people harvesting them around here (not many hound hunters) so they will overpopulate and then you get the crash from distemper or other diseases.
I noticed the number of roadkills seem up this fall.
