It's not perfect but I know that I'm more likely to find a result that serves me, rather than a result that's optimizing for an algorithm. And if I do come across something spammy, I know that telling Kagi to adjust a site lower (or remove a site from results) is just 2 clicks away.
Even though it's a small thing, it's one I encountered with every Google search, manyamnymany times per day. Relieving that is worth more than $10/mo to me. I think that pricing is right, though—if it were more than $10/mo and I likely never would have tried it.
The only thing I use Google Search for now is hyperlocal stuff, mostly I expect to interact with Maps result. Kagi Maps isn't even close.