1) It has a set of rules and regulations
2) There are frequent tournaments and championships
3) It can be physically and psychologically demanding.
4) The above is all you need to classify it as a sport.
Hence, it's a sport.
OH LOL- according to chingy's guidelines, that makes machinima a sport.
[Edited by Latiosmaster47, 6/1/2009 10:27:29 AM]