Ok so I got a survey from ebay a month or so ago asking if this would be something that would work and of course I said no. I have no interest in being forced to do anything.
It is like eBay missed the basics of business — DAZZLE PEOPLE.
If you dazzle people, they will come in droves!! There is no need to force — you are not the police dealing with criminals or prison guards forcing prisoners to move around. You are a marketplace, fix your issues, make managed payments something people will want.
Forcing is NEVER a good idea.
Here is more info on these letters from eBay to sellers.
eBay sending letters FORCING POWER SELLERS into Managed Payments whether they want it or not!