I surf, and also build websites. What does this actually do? Store a photo/video of a surf spot by location. Is that all? What incentive is there for people to do this?
It's kinda crowd-sourcing of surfcams (coz those don't really deliver)
In general, surfers don't want to help other surfers find the best spot of the day. Once you're there it's different, and many surfers are really helpful/friendly. But hardly any will say "this spot X that you've never heard of is going to fire today", especially when they know you'll head to the big town beach break away from them ;)
I know surfers that'd give me a lot of shit if I posted video of a spot firing. I know I might do the same if I found out ;)
My suggestion would be to make this a private group thing. Create a, ahem, "circle" of surfers and share reports with them.