I think it is worth it. Just don't put any more $$ on the site than you can afford/ are comfortable in losing (even if you're a +ev player). Or don't leave a leave a big sum on the site if you have large score. I just consider part of the risk of playing.
It's a risk that you can minimize by doing your homework and wisely choosing a site.
The amount of choices of players pools is already small enoughfor US players, no need to further decrease your options.