Vanig wil support cryptocurrency this means that as a user I don't have to worry about the type of currency am possessing and also vanig will be direct competition to fiat based e-commerce site which is going to be good for vanig as it would draw public attention.
Well i think they will also offer an avenue to involve those using fiat, as the cooperation of both currencies will lead to the attraction of a much more bigger community which invariably leads to faster growth in the value of the token, as well as the involvement of those that never wanted to use cryptocurrency in the first place