You can sell soil on the AH pretty reliably. That's the most straightforward way to dump excess poetics. There's also some orchestron rolls you can buy and some minions. If you have jobs at 50, you can also buy the 50 Ironworks sets to use before you can use the 60 Shire ones.

That's the main stuff, really. Right now there isn't a ton that it's needed for. At 70 you'll get Verity and Creation to spend as well.