My RHU Pet Peeve are the articles that tell you to insult the product to get a discount... and the crusty tries this on handmade artisan goods.
Crusty: "This looks like a seven year old made it. I should get it for less."
Me: "Well I assure you I am not 7 years old and the price marked is a good price for my supplies and labor. In fact that costume was featured in ____ magazine last year as one of the top 20 dresses, so if you won't pay for it, someone else will..."
Pro tip: don't insult the artisan! We're far less inclined to offer discounts than big box stores are.