Seller Silence

Seems to me the issue is courtesy. A timely response would be courteous and show there is interest in selling. An acknowledgment of receipt. 

To me, if you place an ad it is common courtesy for the seller to quickly respond to questions.  No or a very delayed response is a “Red Flag” warning ⚠️ .  Do you really want to trust this seller to complete the sale without delay or issues.  When I experience poor seller communication I just move on to the next listing…

Isn’t that up to you to call the manufacturer and have them explain the warranty? If you purchase gear that’s more than 1yr old, I would assume there is no warranty. If you’re not the original purchaser with an original receipt, I would assume the manufacturer won’t honor the warranty. The fact you want to give the Seller negative feedback when you haven’t purchased the item or had any communication with the seller is dirty in my opinion. I do agree that the seller should have better communication and try to answer your questions. If you have zero communication, just move on. 

I wouldn’t deal with a seller who wouldn’t acknowledge what appears to be a perfectly valid inquiry. It seems the sensible thing to do is simply to move on. 

The seller could have multiple offers to buy and is working with the most likely to purchase. See if the item is taken off the market or marked as sold within a week or so.

Out of courtesy they should at least respond.