To be fair, none of the fee structures are set in stone according to Blizzard, so all of this is just speculation based on the best info we have right now. If they severely change the fee structure or the $1.00 min. required bid on all items (even stackables) then the overall analysis completely changes! It's fun to speculate, but we'll have to wait until they announce official fee structures to really see.
I beleive gold will be by far the number one seller on the rmah. As such this means while we make gold on the gah trying to work off of making at least 17% mark-up to break even and then loosing 15% of our profits to the rmah fee.
Here is what I see happening with the gah, Things will be the cheapest in the morning on weekdays monday-thurs when there are not as many players on causing supply to over take demand. The best times to sell will be Friday night, Saturday night, and Sunday night. Whether or not we are able to make a 17% mark-up on things when they are there cheapest throughout the week, compared to what they'll sell for on the weekend.....I think 17.6% is just a little bit to high.
With the rmah i think tues-thurs monrning will be the best time to buy. Best time to sell will be Fri,Sat,Sun, and Monday. I think prices will spike Sunday and Monday becuase most players will have used there free postings for the week, leaving low supply and high demand.
I another way to make money will be when you buy an item off the rmah, and sell it for much more on the gah worth of gold, then sell the gold on the rmah. Say you spend 10.85 (add the .85 listing fee to it) dollars and buy a popular unque, then turn around and sell it for 15.02 dollars worth of gold. You need to be able to make a 38.4% mark up (count the .85 listing fees into the purchase price) to break even though. A much larger number than the gah, but poeple might be more comfortable paying 50% more in gold if its not cash coming out of thier pockets. 15.01-15%gahfee=12.76-15%rmahfee= 10.852 (broke even at 38.4% markup) 27.75% in fees.
Everytime I look at it, I keep thinking blizzards wants you to play the game to make wealth....the fees just seem so high. I think if your gonan make the most $$$ per hour its gonna be farming and then selling it all on the gah then sell the gold on the rmah.
That makes me thing that an unscrupulous Blizzard employee could make some real money by insider trading. I.E. The next patch will reduce the salvage rate of Magic Items. That person could then go in and buy up as much Subtle Essence or its NM/HL/IF versions of it. In the real world we have laws to prevent that and I'm sure Blizzard has guidelines for just such and instance. But, how many degrees of separation are they going to check?
<Take Tin-Foil Hat Off> lol
Would I be one of the programmers, I'd definitely do that.
Seriously, who would know?