just remember if you start your 5box team using RAF you will get 4 free mounts and level 3x faster than when you solo'd, so that will save a lot. plus you will not be alone, you have 4 toons backing you up. so you don't need the best gear. not like when you are solo. 5 lightning bolts + 5 earth shocks will kill most mobs 3-4 levels higher than you. also you will be collecting the reward from 5 quest turn ins. so pull your gold and one of your toons should have enough cash to be able to afford some big bags.

if you have some friends on playing on the same server than get them to lend you some gold. you should be able to level quickly.