Cabela's stuff is kind of a gold standard of supplies for outdoorsmen. Without putting Cabela's on the game it'd just be like...Big Game Hunter 2013 or some generic title, really. Other than that, like Madden and Tiger Woods, the games are generally identical to each other just different settings based on what game there is hunt. The appeal is for outdoorsmen and hunters who don't really want to have to go out and do all of that stuff.
...couch huntsmen and so on. The appeal is the same for those who like American football deal with Madden, if you like football you'll play PES or FIFA, fantasy you'll play roughly any game that isn't modern-themed or a sports game, and so on.