^ I still see it as to spend BTC only on big purchases, though.
Who would want to spend it for something smaller or daily when you can get much more value by just.. Not doing it, basically?
Why not? You are making assumptions how other people are using it. Each person will have its own reasons to spend it or not. Have you heard of Gresham's Law?
In economics, Gresham's law is a monetary principle stating that "bad money drives out good". For example, if there are two forms of commodity money in circulation, which are accepted by law as having similar face value, the more valuable commodity will gradually disappear from circulation.
This is what is often happening. Why should I spend my precious BTC for any purchase, small or big, when I have much worse money that I can use instead? People have simplistic and wrong views that come due to a lack of knowledge. In this case, the lack of use is not a negative thing but a positive outcome that arises because Bitcoin is so much better money than anything else in existence.