I will advise you buy bitcoin based on your projection of it's price over the next 10 years!
You know many people who fear to invest in bitcoin do so because they are thinking that the price has gone very high per one and that it won't rise again abovr such and they want to look away but the price does better each time it starts for bull and going above last ATH and creating a new status. This shows that bitcoin is just in starting point and has yet started to increase. Things are different now, the level of education and adoption is not the same in 2017 and this is why that the price will keep going up the way I feel
What happens is that those people are only thinking about the short term and not about the long term potential of bitcoin, however I think it is better for those people to not come to this market, after all we may be thinking about all the profits they are missing, but I think people with that kind of mentality do not have what is necessary to keep holding their coins when adverse conditions come to the market, so it is better for those people to invest in other markets that are less volatile but that do not have the same long term potential.