From my point of view, I see myself (multibox) as driving a lorry, which can carry more things from A to B, at the expense of moving slower.
While normal player, is driving a sedan car, moving at whatever speed they like, carrying much less then a lorry, from A to B.
Unless Blizzard clearly state that they start to ban lorry (multibox), it would be no issue for me as far as I'm concerned.
This is just a game, I play it for fun, I'm having fun.
I have disposable income to buy gold, to subscribe for this service, to gear up my toon, to have fun in my spare time.
$$ that I spend in this game is much less compared to what I spend in night clubs, in one night, and it might not be fun~