True, but how many games do they end up playing in that interlock? (I could figure that out, but a) I'm too lazy, and b) we need to make sure retired professors still feel they have a value in our society...)
The NCHA and MIAC play a lot of interleague games and have a formal interlock schedule even if the games don't count for points. SUNYAC and ECAC West may not have anything formal, but tradition and geographic proximity results in a large number of interleague games between those two conferences.
However, your general point does bring out a key issue to the whole better conference debate -- unless there is an even amount of games between all the teams of every conference (i.e., you can't have say a Plattsburgh play Lebanon Valley five times and declare the SUNYAC rules over the ECAC West), using this data for the debate is meaningless.