Oh, you don't need to PL them through that starting area. (Nor can you enter as it takes place in the past) It's a really fun and fast-paced quest line, and a lot of it isn't grinding or killing as much as pure fun quests.
Sure they start at 55, but before they're even allowed out into the real world they're 57.999 at the lowest. (kinda a pain when you leave the starter area, enter a zone, and DING from discovery experience)
Yeah if you wanna run 4 or 5 at the same time I could see that as feasible. I only remember one or two collection quests.
If you've got a mage with TP: Shatt or a warlock set up you could probably make a few thousand gold a day just charging 10g per port (and they'll have the 10g as a result of their starter quests too, and probably gladly hand it over)