That is an interesting thing you are raising here. I think right now the point of the paid plan is the scheduled queries, which are the more compute expensive, that's why the pricing like this.

Now, I do believe that I may just increase the free allowance, and maybe if I see people that want to power use normal queries and have maybe a few scheduled ones have an mid tier plan (or even on demand) that allows more queries and a few schedules.

And eventually move the PRO to be a really PRO plan.