Bitcoin is a long term project. Therefore it makes sense to save small parts over a long horizon. Do you save Bitcoins for your (grand) child or children?
For those who do not have (grand) children (yet), would you save Bitcoin for them if you would have (grand) children?
I think by the time I'll have grandchildren bitcoin might no longer exist. I'm not saying I don't believe in btc, but it is impossible to look in such far future, so I'd better earn some money, build a house and live it to my family. Realty has always been a reliable investment.