Skeptics will always be skeptics. The thing is, if you are having a hard time trying to convince them of the BTC, then show them how much it is worth, and that it can be legally sold for a high price. If something is a scam or a ponzi, then why does it have value, it is as simple as that.
those people who are thinking that bitcoin is a scam those who doesnt even know what bitcoin is and what bitcoin can really give to them so i think people are saying that bitcoin is scam because they really dont have the idea and the knowledge about bitcoin and people are afraid to loose money thats why they think its scam.
Of course only people who don't understand about bitcoin that says it because they only have a limited view about bitcoin, maybe all they hear is television news about the dangers of investing in bitcoin. so what he says is a bad thing about bitcoin. people who know about bitcoin will certainly think that bitcoin is a profitable investment.