Don't know if this is just happening to me, or if it is a universal phenomenon. I've been getting a ton of new EBay bidders (under 25 transactions, many under 10), and the original cover PHB has been the subject of regular bid wars pushing sales over $15 a piece. Oddly, aside from one aberration, the original cover MM and DMG have not been the beneficiaries of bid wars.

Also have not been getting much feedback from buyers of any level of experience lately, even though my packing and shipping habits have not changed.

Any thoughts? Twilight Zone?

I don't tend to get much return feedback.  I leave positive feedback after someone has bought something and paid.  In the followup message I send after I ship the item, I say something like "I have also left you positive feedback and would appreciate it if you would do the same when the package arrives.  Let me know if there are any problems, etc...".

Maybe 15% of buyers leave me return feedback.  Its not something I really care about so not a big deal.