They won't do it. No reason to be losing money.
if that were an option, I would have 2 free years of gameplay coming
Is this guy for real? Dunno where you have been for the last 10 years, but there are people who have played WoW for 9 years or so continuously, some with several dozens of accounts, who not only haven't paid not a single dime to Blizzard for their gametime, but they have also made money from WoW.
Some made a LOT of money, in fact so much money that were I to mention the total revenue minus expenses of a 9-year WoW veteran from and through WoW you would find that number ridiculous.
I've seen some shit on MMO Champ but this is up there with the worst of it. Why would they give people free playtime for deleting their characters?
If I were an employee of Blizzard, and I walked into the Conference Room and presented this as an idea, I'm pretty sure I would be immediately shot, killed, and thrown into the dumpster where they put the guy who implemented in game voice chat and the art designers for Trial of the Crusader.
By buying a 90 blizzard gets money, by killing a 90 what does blizzard get? Nothing, thats why it will never happen.
You are not paying for the 90s themselves, you're paying to skip the leveling process up to 90. Buying a level 90 boost is an investment of money vs. your own time.
Blizzard has nothing to gain frm doing what you are suggesting. I find it hard to believe you aren't a troll, but your continued efforts to justify this weak idea are leading me to believe otherwise.