I don't know how much I'd charge for it. That's a hard one to answer. You obviously used good yarn, and Fair Isle knitting takes time...so you have invested a lot in this hat.
But, regular folks will only pay so much for a hat. If you were putting this hat in a high-end ski boutique, someone might pay $80 for this hat. I could be underestimating.
But even at $100 for the hat, you still don't earn diddly for your time after cost of yarn is factored out.
If I were going to knit a 3/4 coat for someone, like say SYLVI (below) I'd charge $600 plus cost of yarn. And I wouldn't be making much per hour at that price.