I understand what you're saying, and don't want to beat this to death. Buyers can have problems determining condition, or worry about hidden flaws. Sellers can have problems with bidders asking for information already provided, or asking for levels of detail that just smells like trouble to the seller.

At home I buy almost as much on ebay as I sell, and when I feel the need to ask questions, I do. If the seller doesn't answer, or the answer is inadequate, I weigh that in my bidding decision.

As a seller I absolutely get ridiculous questions from bidders who either never bothered to read more than one line of the description and didn't look at the photos, or didn't care about what they read/saw.

It is the bidder's choice whether to bid or not, it is the seller's choice whether to block what seems like a problematic bidder. For the items I sell, there are many potential bidders who won't likely cause problems. I block bidders liberally to minimize my selling problems. The only potential problem for the seller is limiting the bidding pool, but since I don't have trouble selling items that hasn't been a problem.

As a bidder, I almost never bid on anything that isn't easily available from other sellers, so I avoid sellers liberally if I'm not getting enough info to be comfortable, or if I don't like their attitude. The bidder's problem here is limiting the number of potential items to bid on, but that hasn't been a problem for me, either. There's always another whatever being listed, I'm fortunate to have plebian tastes and not be searching for anything that is truly rare.