I've been posting on Sherdog since 2003.
I remember way back then, nobody really knew what UFC was or MMA or anything, only the hardcore MMA nerdists.
Anyway... I remember Bleacherreport used to promote the heck out of their posts in Sherdog haha.
I mean, they literally promoted the heck out of their work in other popular forums, and as a result they're now massive.
Case in point: If you work hard, I think there's feasibility in the sports market.
Sports are a form of entertainment, which will always be popular in USA.
PS: Maybe even try writing for Bleacherreport? They have a "Write for us" section, and over a massive variety of sports.
Just my $.02 man... I wish you luck in your writing ventures.
PS: Speaking of Sports Writers... Have you ever read any of Mitch Albom's stuff?
If you've ever read "Tuesdays With Morrie"...
Just follow Morrie's advice.