If I want to buy/sell parts on FB Marketplace, how important is feedback, profile, and friends?

I use my wife’s Facebook account, since I only use the marketplace function and I really don’t care about the whole sharing my life in Facebook thing. I will tell you that a lot of times people do not respond for whatever reason to an ad that they have up. I don’t know if it’s a scam thing or they’re just being lazy. I do agree that marketplace is much better than craigslist or OfferUp as far as finding good stuff for sale. You just need to treat it as another social media site that has the same type of feedback as all the other for sale sites. Just my two cents worth.
Neither I, nor my wife, ever wanted to have a FB account, as both of us would rather live our lives than document it.

And we'd prefer to keep our privacy (or as much of it as possible these days), thus the name of our dogs on the account, rather than either of ours.

But if I'm going to run into roadblocks that I've caused for myself....