For those of you unfamiliar with the sailing sport, it is unique in the fact that it is intensely physical and action packed, but also governed very strictly with rules and procedures. It is not uncommon for a crew to finish a race sweaty and exhausted and a few hours later meet in a ballroom in black tie attire to go through a procedure that is reminiscent of courtroom proceedings to determine if a rule was broken or if a foul play was involved.
A team who we often compete alongside recently outfitted their boat with a multitude of GoPros, one on top of the mast, 2 on the bow looking back on the port and starboard gunnel of the boat, 2 on the back looking forward, and 2 looking out on each side. They not only use these to practice, going over the "play by play" if you will, but also during the aforementioned race committee hearings, to establish innocence or wrongdoing. They swear the cameras, which cost them at most $3,000, have won them many a race.
GoPro has done a very good job finding the niche they needed to appeal to, and marketing and fueling that niche to be the backbone of what appears to be a very successful business. Best of luck to them moving forward.