NAHL camps have always been a money maker for teams. After every single NAHL team plays their final game of the season, each and every one has 22-23 of their 25 roster spots already set for the next season. They rely on getting a couple hundred kids each paying a couple hundred bucks to go to their 2-3 camps every season as much as they rely on ticket sales and corporate sponsorships to make ends meet. With huge financial doubts last year, expect the camps to be as full as any.
My advice to you is the same advice I copy and paste to everyone. If you have the money, then go for it. If you don't, then don't. They use those camps to help their bottom line, and who can blame them since it works, and it also gives them the chance to fill in the 2-3 spots they do have open. If they truly wanted your kid on the team and your kid was good enough to play, you would know. They would have been calling him every week last season, they would be knocking down your door. If you have the money to drop on it and you're of the opinion that it would be useful to see how he measures up, then it obviously can't hurt. If not, then stay far away.
If you have any more questions, feel free to sent me a direct message.