This is me and my wife.
She has 4 90s and 1 at 89, I have 3 at 90 and 2 almost there. We both have a half-dozen characters between 80 and 86.
We are more than willing to pay to boost them to 90, so for WoD we can have our pick of which characters we want to play. We've already played levels 1-90 to death. We've already done RAF several times (for the mount but also the boost).
And that doesn't count the 4 or 5 'throw away' 80 and 85 paladin and warriors I've made for tanking/healing an RAF friend up.
So bring on my boosts to 90!