Regarding the letters from two sellers saying sales on eBay are way down, I can state that I have not had a single sale since April 4.
I sold about 100 items per month from 1999-2012 until Cassini was instituted, and then it dropped to about 30 items per month after that.
Then late last year I got ripped off by eBay, PayPal, USPS, Albania Customs and a buyer all as one group of thieves, so I switched to a Basic Store for a few months offering only better items worth enough to pay Registered Mail on for shipping abroad. Sales then dropped to one weekly or 4 per month until April 4 when sales completely stopped. I just upgraded again to the Premium Store several days ago, but still nothing.
Over 4 years of research I figured out how eBay controls visibility and what type of programming it uses to do so, but have yet to share the results with your readers. Conclusion: few things are as nefarious or as dishonest as eBay.
eBay has about two weeks of life left with me if sales do not pick up.