it depends on the situation, when bitcoins has a "storm" which means the price will go down, it must be the alts coins going up, at that moment i have to sell half of my btc to play some alts
Spending or saving the coins is totally dependent upon the choice of the coiner. If someone has an urgent need of money and he has no savings besides these coins then obviously he has to sell those. But in normal cases bitcoins are sold only when the prices are very low and that is mostly consisted of panic selling.
Sometimes you can choose a coin that gives more than 500 X-boxes, and sometimes it's that I bought 1 coin on the IKO and after entering the market, they started to stand 12 times cheaper (