[bagacrap]

Surfing is inherently limited in its scope by the number of surfable beaches. There's not room for unbounded expansion of the industry, unless you count surf-inspired lifestyle apparel.

[mkettn]

No, its not. see: https://en.wikipedia.org/wiki/River_surfing

[kls]

That limitation may not hold true for much longer:

http://www.kswaveco.com/