on 26-02-2017 08:08 PM
Any seller can put you on their blocked bidders list whether they are power sellers or not.
There is a Power Sellers board where they would be able to suggest that other power sellers should block you but it it not a list particularly for power sellers.
Why would you even bother to tell a seller yoiu were going to give them bad feedback? Of course they are going to retaliate and block you.