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Back in the day however, careers were strictly built on competitions, just like surfing, though surfing is changing too so you can free surf and still get paid. So I think that rivalry was really because of the fans and the media who built it up, but it did bring something exciting about the sport, just like in any sport, whether it's Larry Bird or Magic Johnson, I think it just made skating that much more exciting.

Source: theindiespiritualist.com
Back in the day however, careers were strictly built on competitions, just like surfing, though surfing is changing too so you can free surf and still get paid. So I think that rivalry was really because of the fans and