Tampabay.com did a nice job with the article below. It explains that if coaches do not schedule well in the spring and summer, it can hurt them when selection for the NCAA Tourney rolls around.
The Selection Committee's job is not easy. As the pool of 64 teams is being compiled, the Committee has to choose between a lot of really good teams for a small number of slots. The Committee wants to see some distinguishing factors, reasons why they should select one particular college team versus another.
So, where a team plays and who they play is a big issue. If you schedule just the teams that you expect to beat and play them at home, then you might get left out from the Big Dance.