I'm finding that cash is a big problem too.

I started my 5 shamans about 10 days ago with a fund of 10g each (I have other toons with gold for emergency use!). By 30 they'd spent all that and got another helping hand of 100g each to allow them to buy mounts and spells.

At 46 they had to have another 100g each in order to buy spells, and have already spent about 37g each of that.

I'm skipping so many quests (due to simply outlevelling them) that I'm making no money at all. I'm sure it's going to cost me even more before they hit 70, and god knows how they're going to afford epic land mounts, never mind the flying variety.