You have a discount code at your checkout? So basically instead of capturing the sale you're ASKING the buyer to google for discount codes. Think of a sneakier way to give people discount codes that doesn't show it RIGHT THERE ON THE FORM. It makes me feel like I'm getting ripped off when I see discount code and I don't have one.
I do appreciate discounts, but don't feel entitled to them, especially if I'm a first time customer (or opted out of marketing emails). But maybe I'm an outlier and a sense of entitlement is the norm these days.