Unfortunately, your interpretation of the EULA is incorrect. What has actually been posted in this thread where it’s blue text from a Blizzard employee, helps to clarify that you’re wrong and that reporting people putting things on the AH is not going to result in any actions.
Again, if you’re so confident, feel free to ask for clarification in the CS forums. That’s what they’re there for.
But encouraging people to open tickets or opening them yourself for things that are not against the rules can lead to your own account being actioned for GM harassment. I’d recommend against it.