While (IMO), that's not a smart thing for the seller to do, it's one of the options sellers have as to whether or not they want buyers to asked questions before buying. (It's in their settings whether they want questions to come to them.)
Does the seller offer free returns? If so, this is a case where you might consider buying and if it's not right, return it and not be out anything other than your time. And if it's SNAD, you're protected anyway.
@BeenBurned, thank you so much! I never noticed this option in the settings. Interesting and, I agree, not a smart thing for the seller to do. This seller does not accept returns but things would be so much clearer for me if I could get an answer to my two or three questions before deciding to bid, or not bid.