This might be a viable option but I don't think it could work with 'no loss to Spacetime'. What you seem to be forgetting here is the profit Spacetime will undoubtedly make off of what I'll call 'gift card inefficiencies' in the current market, aka, I think most players probably won't end up using all of the platinum they buy, but they still paid for it. In your scenario, these unused platinum would be traded to other players, who then do not have to buy platinum, so that would take out a chunk of profit.
However... on the other hand my general feeling is that whatever profit hit some of these proposed solutions might bring, the added depth to the in-game economy and thus depth to the end-game for hardcore players, etc. would be improved, and overall drive more sales / word of mouth and such and help retain players hooked onto the game longer than without, thus offsetting short-term profit loss. But that's just my personal theory spun out of thin air.
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