Take a moment to think about the target audience here. What would be the key demographic? Who would be interested enough in watching the games at the NSPL to spend 1 day of their weekend watching it?
The only way you'd get a sponsor to pay for it would be to show them that they are going to be visible to enough people who are then going to buy their products or use their services. If not, then who's going to front the cash to set it up? Are you? No one will pay to watch it; so maybe the extra cost should be put on the tournament entry fee? But then the teams might complain because they won't even get to see it.
The only way you'd get a sponsor to pay for it would be to show them that they are going to be visible to enough people who are then going to buy their products or use their services. If not, then who's going to front the cash to set it up? Are you? No one will pay to watch it; so maybe the extra cost should be put on the tournament entry fee? But then the teams might complain because they won't even get to see it.