Why would people choose to spend a better form of money(bitcoin) vs a worse form of money(fiat) given the choice?
People will always get rid of the least desirable thing they hold.
I myself get rid of the worse form of money....by buying bitcoin. I then use the bitcoin to buy things. How else do you think places like overstock see such "large" amounts of purchases via bitcoin? Sure its a little inconvenient, but that is a temporary problem. Ideas that are great in theory, often do not work in reality. If it does not happen in reality, maby you need to change your idea to something that better represents truth? People do not always get rid of the least desirable thing, or are willing to spend bitcoin in order to help bitcoin, even if it is not in their "best" interest.
I can see you aren't very bright. Tell me how does buying bitcoin for USD and then selling it again for USD via bitpay on Overstock.com, help bitcoin? In that entire process you've also paid fees to exchange + bid/ask slippage. You are only "helping" exchangers.
And no overstock.com does not see large amounts of purchases. They've done what 1million in 6 weeks? That is less then what is traded on bad days on some of the smaller exchanges. It is also miners that are shopping there, you know cashing out the 3600BTC they create out of thin air on a daily basis. Of course a few diehards such as yourself buying btc just for the sake of selling it again.
Really? You do not know how merchant adoption helps bitcoin? Seriously, spend 2-3 minutes thinking about it, you might be able to find out why yourself. I don't care if they transfer immediately to usd(or whatever local fiat), and never touch bitcoins themselves. When more and more people/businesses start accepting bitcoin, eventually holding bitcoins starts to sound desirable.
exchange fees? If you think you don't pay for credit card fees(which get transfered to everyone in higher prices), or that your not paying for inflation, well.......
finally, I admit that overstock does not receive large amounts in bitcoin relative to their size, re-read my post, notice the quotes around large? But it is enough to make it worth their effort. I also have no idea where to begin on that train wreck of the miner sentence that you wrote. Most mining profit is used to get back the cost of the mining rigs, and what proof do you have of the shopping part? (hint:none)