This is the initial setup, but as there is some cost involved when converting bitcoins to USD and back that is degressive with volume, if many people are buying

This is the initial setup, but as there is some cost involved when converting bitcoins to USD and back that is degressive with volume, if many people are buying through bitcoins, it would start making sense for Overstock to hold the bitcoins for a while and convert them in bulk, so this could eventually increase the demand for bitcoin after all, no? (Of course, given the current volatility and volumes, it would make no sense for Overstock to do this yet.)