That's the best thing ever happened to the bitcoin a big step. ... such a smart idea of ebay
to setup a paying method with coins.
Where have you found this revelation?eBay did NOT "setup" paying method with any cryptocoins.
No best, big step... sorry.
Yes, any seller may declare
he takes Bitcoin payment the same way he can declare cash payment or any other payment, and as always, eBay WILL advise buyers NOT to use it
Also seller may be banned because it is actually against eBay rules!
To make it very clear for you, there is quote from eBay Accepted payments policy:
"Paying with Virtual or Cryptocurrencies - Not Allowed.
""Make sure your listing follows these guidelines. If it doesn't, it may be removed, and you may be subject to a range of other actions, including limits of your buying and selling privileges and suspension of your account."