[parenthephobia]

> That's why I've never bought a computer - next year there will be a faster and cheaper one on the market.

Computers are practically useful. If you buy a computer now instead of waiting, it's because the the cost of not buying it later is outweighed by the utility of having it now.

The spending of Bitcoins has no inherent practical value. So long as you believe the value of Bitcoins will go up more than your local fiat currency, the rational thing is to keep the Bitcoins and spend your fiat, unless your Bitcoins are the only money you have.