Well...
- Some buyers actually do know all about the product, and are just looking for one at the right price, or in the right condition or color, or just one near them geographically.
- Some buyers don’t read the ad. They’d rather pester the seller. This is the TL;DR syndrome. I suppose an ad could be so long or so disorganized that I would sympathize with that.
- Some buyers are not nice people, like some sellers. Some "buyers" are not buyers at all. They are just looking for someone to talk to.
It takes all kinds. Good luck!