How to read the result
The nominal cost divides the full package by every included credit. The expected-use cost divides it by the cycles you realistically plan to complete. A large difference means the bundle only looks cheap if you use nearly all of it.
What counts as a feedback cycle?
One submission, the response you receive and the follow-up practice you do with it. This is a budgeting unit, not a measure of teaching quality.
For a closer comparison, read the feedback-cost method, OET feedback offers or IELTS feedback offers.