[Mark McLeod]

Just my arbitrary nature.
You can see the criteria I used next to each regional in the spreadsheet attached earlier.

Everyone's free to reject and rework the numbers as you like.
Just publish the new numbers here with the rational behind it.
If you want it I have another spreadsheet I can post with excruciating team-by-team detail on who was counted as a home team and who was counted as an away team. It might be easier to rework the numbers on that. It's a messy sheet though, because I automatically generated it and then went through reviewing team-by-team to see if it made a coarse kind of sense.

Yes, Texas sees a few Mexican teams this year, but since Mexico doesn't have a closer regional than Texas I arbitrarily counted it as a home team. The same thing goes for Mexico teams attending San Diego. I only counted Mexico teams as away if they hopped over a closer Regional to go someplace like Toronto.

It's really extreme for IA, WY, MT, ID who have quite a drive, but no close regional to attend.

For teams that don't really have a regional I just counted them as a home team if they went to the same place as last year or if they were rookies and the regional was the closest one.