Sellers Not Selling

Why is it lately I see items sitting on Posh and I make a decent offer and I hear nothing from the sellers. I’ve placed orders that were auto-cancelled because the buyer did nothing. Now I just leave messages like “is this still for sale” because I don’t think most of the items on the app are for sale. Are they just dead in the water taking up space? If so Posh should vet out inactive items and sellers, so commerce can commence.