I will say this one thing, unless you are mass milling herbs, you are gonna be killing so much time. I wouldn't even bother with TSM prospector anymore, imo. Just use the cheaper WoD herbs and mass mill. Besides, unless you miraculously getting Cata herbs for less than 2g a piece, it's not worth it.
Secondly, I should put a special emphasis on advertising constantly. These cards do not sell themselves. No one thinks to buy these cards unless you are advertising. As such, you HAVE to advertise all day everyday you are online or have access to trade chat. Hell, even if I am out of cards to sell, I will look at the AH and macro a sale of other people's cards. I do this to ensure the price does not collapse. Other people typically do not advertise, and before you know it these cards are selling 5g a piece on the AH, not even making it worth your time.
So, I will give a suggestion OP did not mention. Use a barking addon. There is one that still works, even though it hasn't been updated, called "Guild Recruitment Helper" or something like that. You can find it on Curse.com. Setup your addon to spam your macro every 4-5 minutes. Now, you don't even have to think about it. It all does it automatically. I also have a trick where I will sell my bigger stacks at like 9.5g each card for 20 (about 190g a stack), or I will sell a stack of 10 for 109g 50silver a stack (10.95g per card). There are many people that buy my more expensive card for the smaller stack. I would say more people do.
Finally, you occasionally get people that talk about the Omens cards being better cause you can get the 6k card. This is semi true. However, probability wise, the 6k card has about a 1/4500 chance on a proc whilst the 5000g card from MFCs is about a 1/2000 chance. Of course, you could also sell the Omens cards using this same method as MFCs, I just found that market to be so constantly flooded all of the time I could never keep up on it, at least on a high pop server. Price was always crashed.
Here are some macros I wrote that will help the process a little, to help OP.
This one will auto-convert ALL of your WoD inks into the ones you need at the Org ink trader, though I am sure it will work just the same at the SW trader:
Code:
/script local a=GetItemCount(113111,true);print("Trading " .. a .. " Warbinder's Ink")if a>0 then if a/200>0 then for i=1,a/200 do BuyMerchantItem(9,200);StaticPopup1Button1:Click();end;end;if a%200>0 then BuyMerchantItem(9,a%200);end;end
Next, you need paper to make the cards to match the inks. Well, I wrote a macro that will buy the necessary amount of light parchment needed to match your inks. It will take into consideration how much paper you already have and only buy what you need.
NOTE: This macro is customized for the Traveler's Tundra vendor, where paper is at position '5', but can easily modified for any vendor that sells paper, just input the correct position on the vendor.
Code:
/script local a=GetItemCount(61978,true)-GetItemCount(39354,true);print("Buying " .. a .. " Light Parchment");if a>0 then if a/200>0 then for i=1,a/200 do BuyMerchantItem(5,200);end;end;if a%200>0 then BuyMerchantItem(5,a%200);end;end