There are several reasons. Some people didn't about bitcoin, some are not interested to invest and some people are afraid of advanced technology. Like this, many reasons are there, we can't judge.
but to me i think people like to use bitcoin. but those people who do not have any good information about bitcoin therefore they are not giving more preference to bitcoin. i am sure when they will introduce to bitcoin in a good way then they will surely start using bitcoin.
yes that is right, those people who do not have knowledge about bitcoin they will not give preference to bitcoin. people like to take interest in such things where they feel some profit, I am sure that if they will get information about bitcoin and if they will know about bitcoin in a proper way then they will surely start using bitcoin and will get profit from it. they just need to introduce bitcoin to them in a good way.