*drumroll* 1S 30C!!!! Now, this means that going trough the whole proccess of reaching level 400 in tailoring and crafting the bag only costs 1S 30C per bag sold. So the final profit for the average seller is around. So let's deduct the fees, 15% of 12G is equal to 1G 80S. SO people selling the slot bags at 12G are making a 'profit' of 1G 81S 30C per bag before fees. Now as per every TP trade there are some fees, Listing Fee (5%) and Exchange Fee(10%), which accummulate to 15% of the final price.
The raw materials cost is 10G 18S 70C (10G for the 'Superior Rune of Holding' and 18S 70C for the 'Bolts of Gossamer'). The TP cost for one of them is roughly 12G (actually 11G 99S 74C).
I discovered this trend while researching 20 slot bags and found the '20 Slot Gossamer Bag'.
