Hi!
You can buy one AppSumo Yodel deal and then get some extra numbers or add additional users.

Hey team Yodel,

Please consider allowing us to stack this deal (i.e. stack up to 3 times). Right now some sumolings are purchasing multiple deals with the intent to create multiple accounts to get additional numbers/users/minutes.

This will be a bit cumbersome to manage, and it seems to make more sense to allow users to manage everything from a single account instead of working around the system.