Yep, in the earlier tor days it was obscure enough to be doable, but I haven't run an exit node in so long I have no idea who would actually host one now. On top of that, the bandwidth used can eat budgets super fast!
>On top of that, the bandwidth used can eat budgets super fast!
Bandwidth isn't expensive though, unless you need "premium" bandwidth.
Case in point, I've used petabytes of bandwidth for scanning this year and and probably spent less than $2k total on both the scanning hardware and the bandwidth. Realistically I've only spent a few hundred dollars on the BW itself.
And good luck even maxing a gigabit line with Tor, it's not easy.