If anyone else is wondering...

I did some research. The netherwing quests award a little over 12k exp. The 70s take around 1.5 million xp per level, creeping up to around 1.6M at 80. Even if you could do ten per day it would take about 14 days to get one level. Guesstimating even just an hour to do the quests each day, thats a pretty inefficient way to level.

The mount should be the primary focus, not the low xp from the dailies.

I will just wait until i get more 85 teams before doing netherwing quests. I plan to remix teams anyway.