Reken is only level 48. If I actually take the time to hardcore level him, I can have him at level 70 before wrath comes out. With a fifth level 70, I don't know which is going to be my main in wrath endgame content (if I even see it in the first 6 months).
His herbalism will likely be high enough to farm herbs in northrend before wrath comes out (which is nice).
I've also got a friend that has enough starter-level herbs for me to get a good chunk of progress on inscriptions without having to farm herbs or deal with the "ooo shiny, new profession" market prices.
Also, when I get to the outlands herbs, I can just hop on Alenrak and go skettis tree farming. The poor trees don't get me below 60% health unless they bring a friend.