Upload & Sell: On
There is nothing wrong with proof books. We did them for years and it worked well. It does take a lot more work, but it's still a better solution than putting them online. I still maintain that once they see the image and know they can take it home with them, albeit online, you have lost the sale. They have to buy then and there... or at least 90% of your sales have to be then and there. I don't think it's even debateable. On-site sales will always do better than online sales.
That being said, anyway you can get the images to the customers, whether it be viewstations, proof books, 4 x 6 all you can grabs, etc, and most important, have a system in place for customers to find those images quickly, will most definitely be a better sales model than card 'n go (here's our card, order online).
Match that with a sales booth that is attractive and eye catching in a prime location, a professional staff of photographers and salespeople that all have staff shirts that are connecting with the parents, and a well diffused marketing campaign and you have a lot of the necessary components in place for a successfull tournament.
It's hard work though. For all those people that tell me... work smarter, NOT harder... they have no clue what it takes. You need to do BOTH in order to have any chance of success in this business.
BTW... Ralph, it's nice to match a name with a face. Great job.