I was reading up on it and that is not how it works. If you do not buy the clone you either stay in Vanilla or move on to BC taking your inventory with you. They could I suppose move it to another alt before hand but then they arent taking it with them. But this will result in the same number of resources that are already on Classic and if they take it with them then they leave the market. The number of resources on Vanilla Classic will go down not up as a result.