Yesterday I was watching one of Jim's amazing livestreams and I noticed that his TSM auctioning categories for Cata greens and mog gear were very different to mine. I didn't take screenshots of my old categories, and until the servers come back up I can't show you the new ones. But adopting the method he uses (and probably many other folks -- sorry I can't name everyone, this was just the first place I saw it!) made everything much simpler and made me way more inclined to continue selling this stuff.
Previously, I had a categories called, for example, gear - xmog - plate - 1000. Within that category I had groups for every individual stinking piece of armor that went into it. This got really messy and confusing really fast.
What I have now is a single main category, just called gear - xmog. (I'll post screenshots of how this is set up after maintenance.) Inside that category I have groups named after the price brackets, so 500, 750, 1000, 2000, 5000 -- at least for now. Here you can see one of the groups, my 500g group (which doesn't have many items in it yet; I'm still setting these up) inside the gear - xmog category. Please ignore the general mess that is my TSM categorization. I'm working on cleaning it up, and this is part of it.
In the group settings for transmog items, I checked the box to add by item ID, since stats are not important, and set up the threshold and fallback according to the price bracket. Here you can see my threshold and fallback for my 500g group. I forgot to get a SS of the "by item ID" checkbox, but it's at the very top in the group overrides tab.
In the category settings, I set the post cap to 1, post time to 48 hours, and the behavior to post at fallback when the market goes below my threshold. (I may change that to not post at all for a little while until I get a better handle on the pricing structure; it's easier for me to pick them out when the text in the auction log is orange.) Here are the category settings:
As I collect new items, I simply add them to the appropriate price group, rather than having to create an entire new group for them. This has already saved me so much time, and it's so much tidier. I'm following a similar method for my Cata greens, except I have those priced by level. (I bumped my prices on those up yesterday and already had a sale at the higher price, so woo!) I haven't had any mog sales yet, but it's midweek and I didn't get much posted before maintenance.
This post probably makes almost zero sense without pictures if you don't see TSM in your sleep, so I'll add screenshots soon.
Edit: I added screenshots but I'm not sure they're actually big enough to be useful. Still getting used to Blogger so I will revisit this sometime when my Internet connection is better.