At the moment, all I can say is it's not allowed. One reason it's not allowed is because we'd have multiple iDs transferring YEPs. There are ways around that, sytem wise, but it's complicated. We're unaware of any league that allows transfer of currency between members.
Don't hold out much hope that this is going to change.
I'll ask Issa if he has any ideas, but I am pretty sure this won't happen.