Lobe stretching and plugs make me cringe. They just scream "I'm a twat! Punch me!"
Most of the time, it usually guarantees the person to never have a proper job... even if they remove them. Also, imagine when they get older, they'll be saggier than their tits if they're female.
Not getting my lobes stretched by a lot. The most I'd ever get is probably 2 mm.
I guess that *isn't* too bad. A lot of people want to get them bigger and bigger until they practically physically deform them.