I’m afraid I’m a caveat emptor kind of chap.
If the seller doesn’t answer questions, bid accordingly.
There’ll always be folk sticking lipstick on pigs to sell them.
I agree, James, with the following qualifier. This points to separating the "wheat from the chaff". I don't follow these BaT auctions at all, as opposed to some of our members here who do this in lieu of watching football, e.g. doing it for sport entertainment!
Some questions are totally inane. They ask minutia that is totally irrelevant. They want the seller to go take that 251st photo because the 250 wasn't enough. They are just time wasters. So, if someone isn't answering a question, maybe they have determined you are not a buyer and dealing with your questions is simply a waste of time?
I do sell a lot of older personal items on eBay; it's not a business, it's a way to simply repurpose that which is no longer of use to me, but has value to someone, and perhaps recover a few dollars in the process. Most of the items I sell transact with no questions. Of those that have a lot of questions, the buyer is rarely the one who has asked them. So, some items that have stupid questions, I just ignore the questions.