If a shop keeper is willing to offer more for a particular item than it regularly sells for don't sell it to him but spend the 1.00 gold to get it ID'd first.
Aye, that's what you do once you start hitting steel (Which sells for a full gold anyway, so you're not really losing anything if it's not something useful.); actually, checking the LUA, it looks like there's only a few weapon egos that effect cost? May be reading it wrong, I guess. The lower elemental egos actually sell for more un-ID'd?
Anyway, iron junk doesn't give a price variance except very, very, rarely, from what I've noticed, (At the least, I've sold a bloody large lot of iron ego weapons for the standard half gold.) so it's not particularly helpful early on and not cost effective at all unless you've got the ID talent or a sufficient magic score for pack ID. Most iron ego weapons still sell for less than a gold.