Breakfast Topic: How many boosts do you need?

Warlords of Draenor is doing something we've never had as a bonus for an expansion before, and offering players a free level 90 with the pre-order of the expansion. This is actually pretty cool as far as I'm concerned, because it means people will be able to purchase the game and play through all the new content immediately, instead of having to go through a long, drawn out leveling process before getting to play with the awesome orc dudes on the box. But in addition to this service, we've also discovered that the level 90 boost will be a paid service — which allows players to boost a character to 90 without purchasing a second game license to get the feature.

A brief flicker on the Blizzard Store with the release of patch 5.4.7 displayed the price for the purchase of this service as $60. Now, I'm not really interested in discussion about the price itself — it's a little high for me, but that's not really what I'm curious about, here. I'm wondering how many people actually plan on purchasing a boost from the store, and how many characters they plan to do it with. Myself, I'm content with the two boosts I'll get from my two game licenses — I don't really need any more than that.

So I'm going to pose the question to you guys, because I'm curious, here. Forget the price we saw on the store. In a perfect world, at a perfect price, how many level 90 boosts would you purchase, in addition to the free one that comes with the Warlords expansion itself? Do you have a whole stable of alts you want to boost to 90? Is this a service that you would realistically use, if the price were right — and how many characters do you think you'd boost to 90?