I think the main thing is figuring out the best buy mats/ sell item points, then just toss up a bunch of buy orders ahead of time and keep the production rolling. You don't want to get stuck paying list price for mats, or needing to sell the finished items too cheap to get the money for more mats or something.
If you have enough alts, the Tomb of the Primevals or whatever it is, has six chests that each provide an item once per day. It's not a huge thing, but takes a couple minutes per alt. I've got four guys there, so just run them around to all six chests (plus some mining or trade-chests if available in the tomb). 4 runs and I salvage everything. Usually like 20 blue, 20 green, 5 yellow minimum per alt.
And of course, Flax has a few zones with spots to park alts to reap some each day, but whether it's worth it, meh.