Here's an odd one. I went to buy a bit of sugar from Chef Jordan Gramsey. I clicked the buy button... but nothing happened. "Okay," I thought. "I must have misclicked or something." Tried it again. Still no sugar. "That's weird," I thought. This time I made absolutely sure to click the buy button correctly. Still no sugar.
I tried it a few more times before I realized that my silver was disappearing. This left me with only one conclusion: Chef Gramsey is a scammer. I put my silver in, but he never puts the sugar in!
Actually, I can see the sugar graphic flash in my inventory spot and then disappear. So it appears Chef Gramsey is a master pickpocket. He gives me the sugar and then steals it back before I can blink.
Note that I have bought sugar from Gramsey before without a problem. Perhaps it is because I have only one inventory slot left?