The Sunken chest I have found 1 in 10 is 100G or more.
Now 10% means I have gotten 2 100g chest almost back to back, and than went 20 more with nothing.
The patterns can sell on the AH for anywhere from 10G to 18s, check the prices, I advise vendoring anything with less than 30s price on the AH. If it sell, after the AH cut, there may be just over the vendor price and if it doeesn't sell you will lose money on the AH fee.