I think for being sure and rich you should at least get 100 bitcoins, otherwise, it would be a risky investment iff you buy 100 now and bitcoin would get shut down by governments and youre bitcoin would get useless
yeah may be at risk if you buy 100 BTC by fiat therefore I use other methods such as a free way to earn bitcoin. but I also need to buy bitcoin when certain circumstances. so buy and earn bitcoin by certain method. I'm sure you can get 100 BTC in that time