I do talk to sellers sometimes. In most cases they want to get rid of me and my questions, at other times I get -you don't like it send it back- response. And I can't say I am fanatically strict, if stated NM record has couple of ticks that's alright, I still consider it NM, and VG+ is too broad in fact for all people to agree on.
I never buy sealed records - you never know what's in there and usually you can't return them.
Biggest problem for me is expensive shipping from and to Japan, often it makes little sense to return the record if shipping is not refunded as well.