The question about pricing is pretty legit given a free Wix or similar would probably be a better experience than jumping across Notion and Potion.
It's not "hackers are going to hack it for free", it's more "your grandma is making a website on Wix for free" and, it won't make you feel like a tech wiz or a startup cool kid, but it works.
That's also why I think Potion (and other startups targeting Notion and the incoming Notion marketplce) is pure business genius.
I'm sure the target market will appreciate Potion. I had to try Notion for work and it's definitely not for me (slow and clunky) - but somehow they have a lot of evangelist in SF startups and I'm sure they won't care about paying 1 pumpkin spice latte per month just to say they made a website with Notion.