I don't think there's a practice here wherein people list and sell their private tokens, the closest that you can get it though it through P2P exchange or DEX. I'm not going to question your goal or your reasoning behind because that's what supposed to be an investor should do. Buy what people thinks that is useless, and maybe just maybe they will have value overtime. I myself have stocks that I bought way back, holding it for 10 years now. It has gained significantly, but I'm not liquidating my assets, as you have said, diversification, buddy.