I see the most RAF, when people are starting to box.
After that, probably when people are moving from boxing a smaller number of accounts to a larger number of accounts.

Or there are people like Tim, who love to level...
So are constantly buying new accounts for RAF, leveling like crazy, then getting new accounts to do the same.




RAF is triple experience, from kills and quests.

But you can only have five in a party at once.
So if you plan on staying as a 5-box... and you want a booster, that's a maximum of two keeper accounts plus two RAF accounts.
If you had a "main account" and four accounts which were added to box with...

And then decided to add Druids, Paladins, Shamans, Monks and Mages...
RAF would make sense, even if you ditched the new accounts after the leveling.
You could boost the five sets in 1/3rd (approximately) the normal time, on accounts BC plus the two that get ditched after leveling.
Then do the same, again in 1/3rd the normal time on accounts D & E.
That costs you four battlechests, to level in 2/3rds the normal time.
You could even transfer one set of toons from the disposable accounts to Account A, if you wanted.

In this case, its using money to gain time.