Hey w86742, Algolia sales guy here. An interesting dilemma!
I would have to know a bit more about your actual site and common user patterns to be better able to match you to a tier. In general, however, the plans try to provide an amount of usage that will accommodate most use cases. Some of our clients have higher storage needs and some have higher operations, so it's indeed true that they aren't a perfect fit for everybody.
That said, the quotas on the Growth tier and up are large. I'm surprised to hear you say you would need more given your current traffic. Maybe you're an outlier, or maybe all of your visitors are search power users!
Our enterprise tier does include "unlimited" operations quotas (within the capacity of the infrastructure, of course). Though I recognize that not every Algolia community member can afford to allocate dedicated hardware to their project.
If you have any specific questions, or want to have a quick chat with somebody about sizing your usage, feel free to drop a line to the sales team at firstname.lastname@example.org. We'd be happy to hop on a quick call to discuss.