Because more than 7 top OOC games is totally unrealistic.
You are asking them to do something no one else does. Gonzaga for instance plays in an even weaker conference, and they don't schedule more tough OOC games, and they still have their cupcakes. AND, it's not even that it is not a smart idea to schedule more than 7 top OOC teams, but also the fact that it is nearly impossible for an AD to arrange that many games.
For every home and home, you have to guarantee a return. And this is part of the problem with this year's home schedule. UConn is on the road at Auburn and Arizona.
I bet if you polled everyone here, 90% would prefer an MSG game to a home-and-home against teams like Providence. If you got rid of that MSG game, you could do a game against PC.
In other words, what are you willing to give up for this?
Look at the schedules around the country. Who schedules 8+ top OOC games. Who has only 3 cupcakes.