1. If I donate $10 or 10 Euro and my account become premium is it forever?
2. Is here limit of how many coins I can acquire via trading system selling gold, items or characters?

I searched answers for this questions and I am 99% sure for the first, but I want to be sure. For the second only one person mentioned it somewhere, but I can't find information in Warmane, even when I asked the GM in game, because here is no way to contact with any support they just gave me link for forum. Really, just post, with no page with all terms what I get when I have premium account and what are the conditions and the limitations?