Just a datapoint, but I feel like I do a lot of searches… I’m always looking stuff up, and I’m also in the habit of using my search engine as a lazy form of autocomplete for urls. I apparently do about 700 searches a month according to Kagi. If I were on the basic plan, I think that would mean I’d be paying $5/mo. + $0.015/search * (700-200) searches/mo. = $12.50/mo.
For what search is worth to me, that seems reasonable. (Or I guess more to the point, how much I value a relationship where I’m the customer, rather than companies expressly interested in using psychological manipulation to influence my behavior…)