Grid/DCA stuff, to put it simply, is buying sleep for yourself: you admit you can't predict the top or bottom, so you use time to change your mindset. A single trade, on the other hand, is about excitement, with the cost of staying up until 3 a.m. watching the market and treating yourself as a human stop-loss. Recently, some people have been interpreting large on-chain transfers and moving funds between exchange hot and cold wallets as "smart money," but I see it more as "anxious money" — the more you see, the more itchy you get to act. Anyway, don't pretend: if you want sleep, don't trade to exchange nightmares; if you really want to gamble, don't use "smart money" as an excuse.