I don't think they will sell special potions or anything like this. I think they are quit right on selling exclusive cosmetic things. No one will die if they don't have an outfit or a certain mount because the two are superfluous things.All mounts have the same speed, its not like you are paying to win( you are paying to look more cool, but its not a crime ).
I trust cipsoft. They are not OTservers, they are serious, and they care for their game most than anyone do.