I would think small scale selling (50 LPs) would make the ideal situation very plausible: play-testing every LP after cleaning, grading conservatively (on the visual side unfortunately) and leaving a nice description regarding how it sounds. If it sounds VG, or VG+, great, write that. Just don’t grade it VG if it looks rough. I myself don’t care about how the actual vinyl looks. I play them for the sound. As you already know, some people care how the vinyl looks.
When I’ve purchased a VG+ record, and it sounds tremendous (maybe even looks closer to NM) I’m a happy, satisfied customer. When I’ve purchased a NM record (which I stopped doing years ago - too many disappointments) that looks new and sounds noisy as hell (whether that’s surface noise or groove damage) I’m pissed.
It not only inspires consumer confidence in me when I see nice written descriptions of the item, but it seems that those sellers usually are good ones, grading conservatively but taking the time to describe how it looks and sounds, etc. This is just my personal experience.
Record buyers are a finicky bunch. I’ve sent a few back, the vast majority of the time the sellers are cool about it. It blows my mind sometimes when I see some sellers with 10,000+ transactions and a 99+% rating. With this crowd, I don’t know how they do it.