Well it is not all that bad.

The fiat money, which overstock actually accepts, has to come from somewhere. This means someone has to go and buy those BTC used to purchase stuff from overstock. So you have an ongoing "circulation" and people buying BTC signifies a demand for it which means a higher value for BTC, which means "cheaper" (relatively speaking) items on overstock, which means people might be motivated more to buy BTC,...etc 

Which also means nothing happens without using fiat money.