Hey there.
Here is a short but VERY successful trick on how to make money with buying transmute cooldowns. I made 2000 gold in less than 5 minutes with it. It is dependant on the server economics, I know that, BUT the situation among the servers should be almost the same. Now here is the trick:
1) Buy Volatile Life from the auction house, 5 gold per item, you need 15 so that makes 75g total
2) Spam in trade: "/2 LF Alchemist with free transmute cooldown! Paying <put something here> gold", 50-200g is the price on my server depending on day time and people offering
3) Tell them to go to Uldum to transmute so you get Volatile Air
4) Sell Volatile Air for 60-80g per item, so you will get at least 840g or if you were lucky and it procced you can get up to 75, that would be 4500g! I think that 75 is the maximum but not sure, but I am sure that it can proc because this was clarified in a blue post earlier this week.
You may have to adjust this to another element but volatile air is used most, so this should be okay. Here is a list of where your transmuter needs to be:
• Mount Hyjal: Volatile Fire
• Vashj'ir: Volatile Water
• Deepholm: Volatile Earth
• Uldum: Volatile Air
Don't forget: DO NOT FLOOD THE MARKET! Have 5-10 up at most and wait until they are sold. They will be sold in no time.
Happy money hunting