There are 2 categories (within the people that really care about giving you real advices, i.e. friends and family) - the true believers that really think in 20 year bitcoin will be the only / most popular currency used on Earth. Considering the limited supply of bitcoin, that means its current value is still several order of magnitude cheaper than when it reaches that goal. So buy 10K in bitcoin today, and in 10 year you will have the equivallent of 1M buying power.
The other category, are the guys that made money out of it. It worked for them, it will work for you, right ? (the same guys that were telling you to buy in the middle of the housing bubble because they sold the house they bought in the 80's for a fortune in 2005)