I do that in low level dungeons if I feel im a bit undergeared for the dungeon. And if they dont follow my numbers I'll just let them tank it.
In higher level dungeons I know people assume a big pull, so I just grab a lot and spam flash until my eyes bleed. Usually never lose any aggro that way so marking isnt neccessary in higher level dungeons imo.

But if they run a head to pull they can tank it, sillyfaces!