Professional tournament fishing is somewhat akin to professional gambling.  It's something more than a hobby, but often something less that a business.  An interesting fish tale:

https://www.mossyoak.com/our-obsession/blogs/fishing/brandon-palaniuk-discusses-the-price-of-being-a...

"Each tournament I fish costs about $7,500 for entry fee, food, lodging and gas.. . ."