I've bet on some obscure things in my day, but I just can't see myself betting on a surfing event. Seems crazy, but i'll admit I know exactly nothing, so I could be way off here. Either way, BOL to you man, I plan on lurking to see how you do, after all we all love money regardless of the obscurity.
Dunlap, the guys who REALLY follow surfing closely will claim to have an edge on the market.
The reason for backing a guy is often "local knowledge." If a surfer is accustomed to surfing in that particular region, he'll feel better about how the waves behave.
In my years of profitably betting on surfing i see the conditions as the singular factor that creates significant value in the market.
Put simply, the bookies can never get the odds correct as the conditions (wave size, wind -whether its offshore or onshore, tide ect) are constantly changes to a large degree.
For example a surfer who is good in the air but bad in the barrels may have big odds, but just before his heat the wind can easily change from offshore to onshore, and he can turn from the underdog to the favourite but the odds wont reflect this.
In comparison a sport like tennis or soccer will always have the same, or similar, conditions. In other words the pitch doesnt change while the waves do.
This coinciding with surfing being a relatively small market and thus with more than normal value, you can take advantage of this a create profit.