Cobbler hit it on the nail, very similar thread last year on AGS. The lack of attendance is due to lack of local interest and the games on TV.
To ngineer- the student body is VERY much different than 40 years ago as many Asians/Europeans now fill the campus and could careless about football. BTW most football players are brothers or hang out at K Psi or DU (the main 2 frats) on campus.In order to fill the stands, approach local schools and offer kids tickets for doing well in school. The family comes and buys food,gear,and has a great time. Many will return if the experience is family fun. To them a win doesn’t matter, but they are in the stands cheering.