Instead of assuming that the team gets only 70% of the fee, why not assume that they charge 100% of what they want, and then tack on the 30% that Apple is demanding? That way, the team is getting paid reasonably.
I trust the team more than Apple at this point. I’d rather they had more control over our billing relationship.
Additionally, I consider this a business purchase. I prefer to keep my expenses separate. Most of my spending via my Apple ID is on personal/consumer stuff. Apple don’t make it easy to switch between IDs for different purchases.