At the moment, I'm either overpaying (because I perform less than $10 worth of queries per month), or the company is losing money on me. And with the existence of the free tier, the business model can only work if most paying users are effectively overcharged significantly. Right now they are operating at a loss in both tiers, if their pricing page is to be believed.
One would hope that costs amortize better with more users (e.g. scraping is pretty much fixed cost regardless of the number of users, but maybe that's already negligible) to push the price low enough for pay-per-use to not feel spendy. (When did you last think about how much one toilet flush costs you?)
The company is aiming to have many users that everyone is overpaying with their $10, so that they make money, thanks to the reduced marginal cost. And the company hopes that the $10 is low enough that enough everyone knows they are overpaying they are still willing.