The thing is, as Bitcoin already proved its ability and if you trust it then it already gave you lots of options to buy with cheap, like after end of provides bull season, bitcoin was down for a year maybe $16k something. But where were these investors who wanna buy Bitcoin now? So you should buy that time. Now its flying and already get huge up. Now its risky. Nobody knows if it going to hit $100k or down to $40k again. Even whom who buy at ath price of $72-74k price, are in loss currently. But if they buy now then they can avarage their buying price and get rid of losses. Bitcoin is valid but don't it also follow some criteria. Don't buy or sell blindly. Although now I'll take risk for buying. If it go down, will buy again to avarage the price.