20 years ago, you could basically draw a line under the #45 RPI team, and everyone above it got into the tournament, and maybe 3-5 other teams would make it as at-larges. Then the MVC started gaming the RPI really well, and sent 3 teams a couple of years and I believe 4 teams one year. The Selection Committee stopped weighting RPI so heavily, and then finally did away with it altogether, replacing it with the NET.
The NET is a black box that no one really knows what is in it, which makes it a terrible selection criteria. Many have tried to reverse-engineer it, and I suspect they are pretty close.
What you need to know about the changes coming to the NCAA NET ratings
www.cbssports.com
One glaring weakness of the NET, and KenPom's ratings too, is that
Margin of Victory is uncapped. Basically, pummeling bad teams is a great way to get a high NET. The idiots at the NCAA probably thought that this would help the power conference teams, but the MWC has gamed it and now has 6 teams in the top 52 NET despite a modest 7-4 record against P6 opponents among those 6 teams. How did the MWC get so many teams with such high NETs? By bludgeoning bad teams. Utah State has a 12 NET and New Mexico has a 24 NET despite neither team playing a single power conference opponent. Nice work NCAA.
The MoV actually helps the Big East this season despite a poor head to head record against other P6 leagues because a lot of the losses were close while many of the wins were blowouts.