Indeed, I would not have time for exchanging and rate following, however buying and holding is very slow and unknown process with no guarantees such as 100% profit in certain period of time. But what here im saying is that if you can invest, you'll have your coins in your control,  but in end of the day you are getting your coins back + % from investment. So think about it if i bought 1 btc and then waited 2 years it to grow until lets say 1,5k so what i did was 500 dollars in profit in 2 years? Meanwhile If I was investing and getting additional % then this would make it much more profitable. There is a possibility you will get scammed if you dont find any trustworthy firm in your opinion if you dont try. Nowadays there are hundreds scam sites and stuff and these sites damage popularity for the real sites because people lose respect and trust into those sites and they just try to do everything by themselves. If I was gonna trust a firm with such investment methods id try of course not put 100 btc but at least 1 or a minimum they accept. I believe crypto money investment possibilities are out there somewhere, at this time of crypto growth it just must be because its just best thing ever could be.