Boxxing x4 rogues

Hi!

Im very new to multiboxing, while I've done it in the past on Pservers I never really made any real progress with it. I got to level 12/13 and thought it were way too slow for my liking. In classic however Im considering dual boxing x4 rogues and having them boosted from a very early level until 45-50. My plan with the rogues would be camping black lotus spots, I already have a 60 mage and warlock which I can use for active gold farming and a lot of the times when Im online I either play my on main or need to take care of work (done from PC). I have one rogue on a separate account at the moment camping a lotus spawn and I have to say its fairly decent when I do get a lotus just from afking.

So my question would be, how would leveling those 4 rogues after level 50 be, will it be all grinding mobs or can I actually do some questing? Is boosting still an option? Once they are at 60 I could always level a proper comp consisting of priest + 4 mages for active farming and if I have time.