Just because someone does something other than the intended purpose and does not do what is beneficial does not defeat the idea and concept. There are tons of stupid people out there who abuse medication, it does not defeat the original intent of most medication, which is to address a certain ailment. Just because someone speculates does not change how companies are valued. And re fiat currency, the only reason anyone works for fiat is because there is trust in its stability and buying power. Even if you could pay taxes with bitcoin or buy stuff, if the trust is not there in its stability and backing of a powerful body behind it then momentary buying power does not equal future buying power. Big difference.
Most people who buy stocks haven't the vaguest knowledge of their discounted future cash flow. Nor do they necessarily buy them on the recommendation of someone who does.
I disagree with respect to fiat currency. You can pay your taxes with fiat currency, a very practical reason for valuing it. You can't pay your taxes with bitcoin.
