How Do You Decide When to Spend More Money?

I just bought this coffee from Green Bean Coffee through Fresh Option Organic Delivery. It was about five times the price of my regular coffee, but I’m okay with that. I’ll readily admit I don’t always buy organic and fair trade. But I feel that I should as much as I can. I’m not broke and I’d hate my wealth or early retirement to come at the expense of an underpaid worker. How do you decide when to pay more for a product? If you do the math, do you use the percentage difference or the actual cost difference?