Would doing this on 10 Shells per day and saving all of the HP cupcakes for 100+ days then all of a sudden transferring a pet between the 10 accounts and gaining 5000hp be doable without getting banned?
Or even doing this on shells and then selling using the 100 HP cupcakes on somebody elses pet as a service? Not sure if that would even be against the rules explicitly if you are only using 1 account.
I don't know that using one account would be particularly frowned upon. There is nothing that prohibits people from adopting and abandoning pets for reasons like picking up petpets so I don't know that cupcakes would cross any lines. I would be interested in knowing if anyone has been banned from exploiting them too much.