As someone who's had the FBI serve a subpoena their information regarding activity on a non-exit TOR relay, there's no way on this planet I'd ever run an exit node, unless I were independently wealthy and could afford a lawyer to deal with the fallout.
I got lucky that the request went to my employer, who knew who I was (obviously) and that I wasn't doing stupid shit, and it never went further than that, but good lord do I never, ever, want to be of interest to the FBI again, even though literally nothing meaningful happened other than me shitting myself for a few months.