I craft and and materia to my items. I spent a few hours crafting to load my retainers up and check on them every 3-5 days. If stuff haven't sold I adjust not because of undercutters but because nobody is willing to buy my item at my price and lower it to meet demand. Then I check on it in another 3 days and adjust if i need to. Normally crafting for a few hours will keep income flow for about 2-3 weeks.

Its not like you buy much in this game other than food and crytals. I could go all out and craft and buy all my lvl 70 gear but whats the point I like blue armor.