>So the parent is right to take opportunity costs into account, especially in case of deflationary currency. If that were a valid concern, why would anyone eve

>So the parent is right to take opportunity costs into account, especially in case of deflationary currency. If that were a valid concern, why would anyone ever spend bitcoins when they could spend cash? If the price is guaranteed to rise as you imply, why isn't it already reflected in the market price? In other words, why are there people even selling it?