If you buy a bitcoin in the price of 9000$, yes it may drop, but we have clearly seen that this is what it does. It goes up and down. If you have 1 million dollars and buy 100BTC (900.000$) then the only thing you have to do is wait. Because someday it will pass that number and you will have profit. Am I wrong?
It's not sound that easy man, you may think buying that big amount will not take you to risk your money, you're wrong. that will make the price in the market rise. In the second though they are not afraid because they don't know what will happen if they invest in it. the only doubt here is if they will get the target income at the right time because these guys most of the guys that afraid to invest are those who need to use their money again to invest in different things. those who have extra money are free to this thing and they can wait up to how many years for the price to increase.
Imagine how big the amount he lose even if the movement is low for buying such huge amount of bitcoins for start, for sure the newbie that will handle that scenario will get rattled and will think about dumping since he will get panic for his money to get drained, Maybe a low amount a good start for their journey so if their money get burned they will learned on why those things happen and they can stand up again and try another strategy to gain on bitcoins.