I am personally a miner, and I keep all I mine. I just sell from times to times what I need to pay for the electricity but that's all. Time said me I was right and with my predictions in the crypto-currency market, I will be right another time.
Yes you are saving for a future consumption's that will help you in a future. Paying some bills you will need a little amount of bitcoins. That's why on the other side you are saving because you are the believer that it will reach to $10000 soon then i will easily do anything in a future with bitcoins. Because bitcoin makes thing easy.