Honestly its all RNG. If you get alot of stones you lost profit. If you get waves you made like 300% profit over raw. Everything else you prolly make 150% extra profit. To me its worth not flooding the market with herbs. I can turn 100's of stacks and tons of life into a few decks rather than post all that on the AH and flood the market.
If you have private buyers, sell direct. If you do AH route, do cards. People make them for a reason, profit.
I currently make about 9 decks. Two stones/four hurricane/two volcano/and one tsunami. Thats over 120k at minimum for maybe a few days farming 6-8 hrs a day, not bad. But I did have to buy a few cards that wouldn't proc and I sold quite a few that I got multiples of. For instance I think it costs around 1.2K worth of mats to make a card. I made 5 Ace of Waves which I later sold for 4.5K each because its high demand. Its all RNG. I also got tons of stone which sell anywheres from 200g-700g which means I lost money on those cards. For the rest of the extras I made a bit of profit selling them from 1.2-1.8k each. All in all I expect to make atleast 30k extra than just selling raw. But the thing is I am still getting rid of all the herbs I farmed which to me is 100% profit.
It is a bit more work. Some people just want to bot, log in and sell. Myself I enjoy playing the game, just not the grind so I dont mind playing the market also.