The GLBC can be as competitive as you want, or as relaxed as you want.
You really don't have a chance to win against the airboat rigs out there shooting 3 ton of fish in a weekend, but they pay out to the top 20 and with some work, that's doable. I think we got somewhere around 50th last year as our first time. Lots of easy access, and they provide lodging and meals if you want. It's all fairly reasonably priced as well.