I've heard quite a few people purchase 4 disposable classic (not battlechest) wow accounts.

RAF from two existing accounts to two new accounts.
The new accounts (disposable) can be any race/class, since you're not keeping them it doesn't matter.
Boost to 60th.
Keeping the two on the existing accounts.
Grant levels etc.
Then ditch the disposable accounts (or level another set).

Then do the same with the other two keeper accounts and two more disposable accounts.

Since you are leveling twice, at 1/3rd the 1-60 pace.
It works out to 2/3rds the normal time.
Which is still decent, but nothing spectacular.

Long story short.
If you have RAF, level a bunch of options.
Anything you think you might want to try down the road, is worth doing now while you have the RAF.