Go to the silk trader just outside the kebab shop in al - kharid. Use all the money you would spend on silk. Then once you have about 5 full inventories of silk (or however much silk you desire, as you get probably 2 k per inventories) take it to the bank and deposit it all except 80 coins. Make sure you take your armor off as you can run to save time.
Run to port sarim and head to the marina (the big dock outside the pub). Pay-fare the captain and you will see he takes you to karajumbwa (the big island of fishing that you smuggle the spirit wine in the plantation quest ). Then run all the way to the volcano and watch out for the lesser demons. Head forwards more until you come to a gate. Open it and you will be in brim haven. Go to the last dock to the east as soon as you emerge from the gate. The captain will ask you if you would like to board the ship, say yes.
The ship will take you to east ardounge, the land of thieving. Got to the bank near the plaza and withdraw your silk 1 inventory at a time(the real deal not notes.) go to the silk trader and trade your silk to him (be sure to tell him you want around 12 coins per piece for it as you only buy it for 2 gp per piece in al-kharid). He will give you the money , at which time you go back to the bank and deposit the money and withdraw coins.
Repeat for even more money or you may just simply steal from the stalls if you are a member (you have to wait about a half an hour after you stop stealing silk to sell it to him again or else he'll just yell for the guards that you stole from him)
For an even faster member way buy the silk from al - kharid and use the gnome glider to fly to ardounge as it takes only about 1 minute. (Im not sure of the price though, having not used it myself)