Ask HN: Is there a market for buying/selling Substack publications?

I’m exploring whether there’s a real market for buying and selling Substack publications. Substacks increasingly look like small businesses: they have email lists, recurring revenue, retention metrics, and audience trust. But unlike micro-SaaS or content sites, there’s no obvious place to sell one if you’re done running it. I’m curious: Would you ever sell a Substack you built but no longer want to operate? Would you buy one rather than start from zero? What would make this feel legitimate vs sketchy? I’m not pitching a finished product yet, just trying to understand whether this is a real asset class or a dead end. Appreciate any thoughts, especially from people who’ve bought/sold small internet businesses before.