Do you get extra Fairyscrolls and/or WE points for each Praetorian you evolve or only for the first one? I've never had two of the "commons" before because I can never breed one and always end up relying on crafting.
The one I bred is level 10 now and I don't know if crafting a 2nd one would just be a waste of time. 10 Essence for trading it is not adequate motivation.