I know it has been discussed before, but I don't recall much of the conversations. (did you search?)
The biggest thing would be setup and planned exposure. If you don't plan on having an "arena" with a good amount of events I would look at another way to advertise with them. Depending on how many different filed you have you could name them like a stadium is?? Like "Bob's Transmission house field", "The Outback Steakhouse woodsball field", or "The Hooters Mounds field"
If you are expecting large numbers of people and have an arena, maybe look at how much local sports groups charge to hang banners, then compare exposure numbers. Keep in mind most of that marketing is aimed at the spectators, not the participants, that might matter to a potential company.