If you live in the Boston area, then go to the MIT art museum. They are doing some exhibit with video installations, and one room is filled with all sorts of videos of people fighting lucha libre. Wow, I forgot that sometimes there are forms of pro wrestling where people do more than two moves per minute!! And moves even look like they hurt!
I'll answer a few points here: 1) Ratings are important for advertising dollars, as the higher the ratings, the more advertisers will spend. Also, a higher rated show can draw interest from other networks come renewal time (as in 2000)