That's a very good idea! In the very least you could work on a polo show that could air on a tv station, such as Lifetime or RFD TV. Do you have any contacts in the TV industry? I do happen to be friends with a lady who shoots and produces reality tv shows, as well as documentaries. She does a lot of work for Lifetime and the History Channel, among others. Plus, she's a horse lover!
Olympic sports are using an alternative platform: Dartfish TV (Dartfish provide all the video analysis software and the TV platforms for many sports)
If you look at sports like Taekwondo they are using the internet platforms to share games and tournaments. There is not yet the interest from the general public to warrant having a dedicated channel. - Similar to the situation with polo
I work with Dartfish who provide World Taekwondo Federation (and many other NGB's) with an online platform that allows them to share content with the entire community. check out. www.dartfsh.tv/wtf
Also look at International Polo Academy's channel www.dartfish.tv/ipa
and an example channel for Polo Teams to show their games.. and also analysis www.dartfish.tv/poloteam
email me on email@example.com if you are interested in hearing more.