I guess one could look at Iowa last year, see a team that lost 5 games out of conference to some tough teams and didn't make the tourney despite 10 B1G wins and think, why bother with the tough teams then. Of course you could also then point to how bad other teams were in that OOC.
I didn't say that they should schedule tough teams. That's not the way to make the NCAAs either. The way to game the RPI is to avoid the lower quartile teams at all costs and to mostly play teams that you should beat. Ideally, your OOC would be made up of mostly teams whose RPI is in the second quartile (RPI rankings of around 90-180) with a couple of first and third quartile teams thrown in. The first quartile are so that you have an opportunity to pick up a big OOC win, the third quartile are to give you a breather now and then.
You only have the luxury of scheduling a bunch of dogs if you know that you are good enough to win 2/3 of your conference games. We don't have that luxury so we need to have the right kind of schedule.
Iowa's RPI was 83 and was dragged down by five teams with RPIs of worse than 250, three of them worse than 300. Those are RPI killers. It's almost impossible to get into the NCAAs with an RPI of 83 no matter how good your conference record is.
If I had to point to a team that scheduled smartly last year, it would be Minnesota. They only played three teams with an RPI of over 200 and only one fourth quartile teams (NJIT at 293). They had six schools between 100 and 150: Arkansas St, Louisiana, Mt St Mary's, Georgia Southern, Southern Illinois, and St Johns - and they won all of them. Those are the type teams you schedule and beat to get to the NCAAs.
Note: I'm not suggesting that Minnesota got in solely because of that scheduling. They also beat some top 50 teams and had a great B10 record. But even some of those top 50 teams that they played aren't teams that you would normally consider powerhouses. Florida State (L) and Arkansas (W) are worthy opponents, but when they scheduled Middle Tenn St (L), UT Arlington (W), and Vanderbilt (W), I doubt that they had any idea that those three would wind up being top 50 schools. They most likely put them on the schedule thinking that they would be beatable second quartile schools.