Credits are confusing. My little dashboard thing where it shows how many credits I'm spending in docker caching, or on users, or whatever, doesn't make easy sense. I don't mind paying you guys, I'm happy with the service, but the billing is really opaque.

Specific points of feedback:

1) How much does a user cost in credits (or dollars)?

2) How is the docker caching thing billed?

3) Why is there a plan that costs $15, then one that costs $2000, and nothing in between?