I levelled my whm to 50, will gear that out and then move over to blm. Don't have to spend soldiery tomes on new jobs, can gear them well enough with coil/mhth. Its fun running expert DR on a different class too for your weekly soldiery.

Can also lvl up crafts and help out fc members. Aside from that? There are tons of free to play games and other things to do. I generally have a f2p mmo I go to on occasion when i get bored. Keeps you from getting burned out.