I have the $10/mo account but I'll disagree with @mrmanager@lemmy.today that it's worth the money.
Don't get me wrong I wouldn't go back to Google/DDG, but while I can afford Kagi's monthly cost I don't believe that everyone can, nor do I think it's an appropriate cost for a search engine.
I feel like I am an average search user, and I easily burn through 1000 searches a month. I'll possibly be upgrading to the $25/mo unlimited account.
If you're used to doing conversion searches like "100 USD in EUR", or "2.5g in oz", or even "20 * 12%" - you get charged for each of those. That doesn't seem so reasonable to me.