Tbh, I wouldn't mind a second account that worked a little differently than the first (so people don't use it to spy on rival flights). It would be fun to have an account that bred dragon flight-types based on the parents so you had a 50-50 shot on getting one flight or the other based on the parents.

I also wouldn't mind if it was tied to the first so you could easily move dragons and stuff over.

Otherwise, like the other anons said - Storage.