If you stay out of the Auctionhouse from 60-70 and complete all the available quests (yes, this means some collections) you will end up with enough gold to buy each toon both their flying mounts and training.
To top that off, do the group quests for Ogrila...
Wrangle More Aether Rays!
Banish More Demons
Bomb them Again!
The Relic's Emanation
Fires over Skettis
Thats 60G a day for what amounts to 30-45 minutes of your time.... if you solo them. All 5 of those including Simon Says (The relics emanation) can be done as a group (You have to play big simon and kill the mini-boss). So 60*5 = 300G a day for well less than an hour's work. While doing ONLY this would take you just over 3 months to get your epics, I think you would be silly to pass up the 300g a day.
Top that off with farming primals and you have your 6 mounts in a very short amount of time.
