Feature Request: Child pricing by amount Variable seat pricing cost

[kimwhite]

Variable pricing that can be based on how many seats are purchased.
EXAMPLE: 1-5 - $5 each
6-10 - $4 each
11-15 - $3 each

Describe the solution you'd like
We have a snippet that did this for the Sponsor plugin:
https://gist.github.com/kimwhite/95f6fefea551867edfb18c81c3f617c0

Currently, users can do this by having different levels for different amounts of users.