What do you consider "low"? On my server Ghost Iron bars are about 6g each and I sell them in batches of 20 1/2 stacks. 1200g every few hours is enough to support my toons.
My farmer is a miner & alchemist so whenever the price drops below that I just convert them to Trillium. The Living Steel is a nice bonus.
The problem I find with the "good money" professions like enchanting, jewelcrafting, inscription, etc is that while the items get a good price you'll have to repost them over and over before somebody buys them. Pain in the ass.
I miss fishing profits, before the Anglers the only competition was other botters and really anal players.