Some poor bastards tried to cut their losses at 4k USD not long ago and a month later Bitcoin was worth more than 10k. Any good advice for them?
As always - go against the tide, during panic sells you buy, when greed blinds people you sell. And buying when the breakfast tv is fuelling the hype is the worst decision you can make (unless you will keep BTC in your wallet until the next bull market with new all-time highs takes place).
Of course this is not the most effective way of investing in BTC, but it works if you have little trading skills.
Don't worry if they sell. It is best they are gone. We need people who love and support bitcoin no matter what the price is. YOu can't just be in it for the money. Bitcoin has performed so well there is not much more you can ask for. Still, people always want more and are never happy with what they have. Greed like you say. Also being in foolish stories that they might be the next bitcoin billionaire. I really don't know what this OP is talking about. Sounds like FUD to me. You cannot argue with a person like that so why try?