My sister was pointing out some thing rather interesting...
WoW has the recruit a friend program. What happens if you happen to be over level 60, you can recruit a friend to start playing WoW. While your level 60 character is going help out the new player with quest, the new character is earning 3x the normal XP. So where it would normally take about 2 weeks solid play to level up to 60, you can have a level 60 character in about 2 days.
And the new player account has this benefit for the first 3 months so he/she can explore other classes and races.
This only works with new accounts, and the level 60 recruiting character needs to be willing to put the time in to help level up the new account.