Hi AviWorlds,
That is indeed our goal, to enable merchants to sell to all virtual worlds from a single location without having to deal with anyone's virtual currencies and to enable people to buy content they can take to multiple virtual worlds with as little effort as possible.
People should be able to buy content they can take with them when they move between virtual worlds and merchants should be able to decide which of their items will be exportable to the metaverse. Market dynamics will define how much premium merchants will be able to charge for exportable items.