Check out Dave White's website ( http://www.k-63.com/
). You'll find some superb windsurfing shots there that might give you some inspiration.
Also go to www.windsurf.me.uk/cpg133
where you will find loads of shot by UK windsurfers. One thing I have noticed from that is the general standard has massively improved over the last few years probably due to the instant feedback digital provides. To make it in photography you really need to market yourself and know your market well. Good luck with it.