Here's a helpful post on pricing:
https://www.etsy.com/blog/en/2012/a-simple-formula-for-pricing-your-work/It boils down to this:
Materials + Labor + Expenses + Profit = Wholesale x 2 = Retail
Can you even pay yourself back for the materials in your $10 hats? What if you were paying yourself an hourly wage to make them? If business exploded, could you hire someone else at the rates you pay yourself to help out?
You are the only one who can decide what prices you're comfortable with... but hopefully this will help you start thinking about it all.