All of my gold came from everyone buying stuff at a really marked up price for instance BS 2h mace if it proced epic i was making at least 125k per one and i was making batchs of 10 to 15 it was like 25k for blue and 125k+ for epics at the time. And i was buying the ore for like 16g to 40g a pop so huge profit. Im still trying to figure out what im gunna do now to rebuild it will be a slow process now.
While the proc is random the law of large numbers will mean that over a large enough sample size your actual yield will be the same as the average proc rate. If you transmute 10 times then you can't rely on the 20% proc rate, once you pass 1000 though, you're average will start approaching the true rate of 1.2 bars per transmute. If you are in this for the long haul it then makes a lot of sense to use the average proc rate to calculate your profits, especially considering the fact that all the items involved sell really well.

The Escalation patch has introduced several new scenarios with respective heroic modes that provide shiny new loot. It is still too early to predict which of these will demand the highest prices at the auction house or AH, since it can take weeks for players to work through the content and determine the value of the new drops compared to the existing items. Many expect the rarest and most prized drops to start commanding handsome prices starting June, so just keep your eyes peeled for popular WTB requests in general chat and high-selling items at the AH.
Short term raw material flipping. I think there is a thread up here about it atm actually. If you are buying to hold for more than a week you're opening yourself up to a lot of risk. Buy in the morning and sell at night, and/or buy on the weekend to sell during the week if you have a decent raid population on your server. Start with something you understand, sell from that market and then expand.
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