There are many nah-sayers about boosting, so I did a test today. I had 7 full hours to play WoW today (<3 mondays). I took the first 3 hours and just boosted my group through stockades. I would drop 1 team member, add my 70 mage, clear, then switch to drop another teammate. I did this for 3 hours and got almost 4 levels.

I sold stuff, repaired, banked the cloth I picked up and D/E'd a few greens.

Then I started doing DM with just my group of 5. I ran the whole place twice in just over two hours and didn't even get a full level. My team is 23-24. I think I am going to follow some advice I read and start with DM graveyard tomorrow.