You do realize that works both ways, right?
"Why should players be limited on having to play with multiboxers on every server? Why shouldn't players have access to one without, when they have all other servers to multibox in?"
There's nothing ridiculous about the poll, when you take into perspective that multiboxing is the "odd" part here. Claiming that it's "like asking multiboxers if everyone should multibox" is the actual ridiculous comparison. On other servers there's the justification that they usually generate a nice amount of donations to get all characters geared, but that isn't likely to be true on Lordaeron.
If there's something unfair about this poll it's just the fact everyone knew the result even before it was started. Multiboxing is a very polarizing topic, and few people really don't care one way or another. The rest ends up being multiboxers and a few others being for it (surprise, surprise), the vast majority wanting each character having a different player behind it.