It depends. Is it Joe Six Pack in America who just heard about on CNBC has carefully saved up 400k in savings and put it all into BTC at 28k? I would say that's foolish, although a gamble that might work out, but only if he can bear possibly seeing his net worth plunge by 75% before rising again. Is Joe Six Pack going to start buying BTC every month with extra savings? Then it doesn't really matter if he started out now or waits for it to come down 30% or whatever people are expecting. I have known about BTC since it was 300 bucks and learned how to buy it at that time. In theory I should have hundreds of coins, but I don't. It's probably for the best that I didn't because all I would have is regret anyways. My original account was hacked and everything taken by some dude in Turkey (or at least that is where the trail ended). My fault for not securing my account better. At least today's buyers have better security and more liquidity if needed.