Income 170x$400 (guess price)=$68,000
So before parts, labour, utlities, marketing, you are already down to $56k
If I were an owner of a business I would want to make that as a wage so it would seem to me either you do all the work yourself or you will never make much money.
Plus to compete with the big guns even at a local level you will have to offer something special. Bespoke shapes and designs. I don't know how much it costs to create a shape and a new mold but I can't see it being cheap.
I know there are bespoke surfboard companies but think about the difference in numbers of people who surf compared to wakeboard.
I think it would be cracking business for someone who loves everything wake but you would imo need $100-200k investment, time and be willing to make very little profit.