I see where you're coming from, and I could imagine that finding a therapist who has been through similar issues would be helpful.

My two cents--it's never been something I've thought to ask. For me personally, I felt like finding someone who specialized in what I'm dealing with (trauma, pstd) was more important. I don't expect my therapist to have gone through what I did or been in the same situation, nor have I ever sought out people who have had a similar upbringing. Hearing firsthand accounts of others who also lived through a similar abusive childhood is way too triggering for me and something I go to great lengths to avoid. (It's how I successfully got to my mid 30s and never dealt with my issues--living in denial is a great way to stay stable, haha.)

I've never asked, but I assume my therapist had spent a fair amount of time on my side of the couch--he's a gay man whose mom is also a clinical psychologist, so I always assume there's no way he hasn't been through a ton of therapy himself. ;-)