Rituals of the New Moon is a scribe-made item which is learned from a
scribe-only drop in Grizzly Hills. Unlike other professions such as Enchanting, Leatherworking, and Jewelcrafting, this is the ONLY dropped technique for Inscription. Because of this, only a very small percentage of scribes know about it or have the technique. Of course, this is an opportunity ripe for the picking...
This awesome thread in the
JMTC forums turned me on to marketing these. Rituals is unusual because it is a vanity item that is extraordinarily easy to make - for me, crafting one Rituals costs about 35 gold to make. However since the number of people who know it is low, it is still very profitable to make. Some people can sell them for up to 500g! Unfortunately on my server that number is much lower, but still great profit (150-200g).
It is generally agreed that Rituals don't sell well unless you advertise them, because a lot of people don't even know they exist! It goes to follow then that you should have a /2 macro to advertise these whenever you're in town and idle. But how do you link an item in a macro?
This can be a bit tricky. Remember, this first part is done in CHAT, NOT the macro editor. Open your chat cursor and paste in:
/script CreateMacro("Macro Name", 1, "item link", nil, 1)
Where it says "Macro Name" type in the name you desire. This is the name that shows in your macro pane and on the button.

/script CreateMacro("Macro Name", 1, "item link", nil, 1)
Now, delete 'item link' and between the quotation marks shift+click on an item to link it in the chat pane. It should look like this:

Now hit Enter. You should have a new macro in your Macro pane that looks like this:

Congratulations! Your macro is now ready. You can change the macro's icon and add text around the item link as shown in the first picture. YAY!
Using these types of macros I can advertise direct sales or that my Rituals are up on the AH. Sales vary from day to day, but Tuesdays, Wednesdays, and Sundays are the best days, in my experience. Tonight I made over 1500g in 40 minutes just advertising to the pre-raid crowd. Of course, this is an excellent way to sell any item you need to advertise (Mechano-hogs, for example). Good luck and happy scribbling!