It's just smarter to make better versions or completely original hats, and sell them in some shop where it will be used by many, and not just a select few. No one is paying for these "free" hats, so...

Out of these hats, nicest looking (imo) are 1, 2, 3, 9, 12, 13, 14. Favorite by far is the 3rd one (red helmet). It's simple, no big horns, or any other extra and unnecessary details.
Not discrediting the skill of the people who worked on these hats, maybe the lesser of the quality hats tend to get chosen for the reason stated above.