For me at least it saves me whole minutes and lots of stress on about half my queries which means at $20 it pays for itself in half a month and as a free bonus I get better results for the rest of the month as well, an ad free experience, no tracking and the opportunity to support a Google competitor.
I agree that 20 bucks is relatively a lot of money. On the flipside, running a search engine does not come for free, curious what the costs of Google would be without the ads.