That's a fair and valid point.
While I do not know all of the criteria the USBC uses for selection for sectionals they have made it clear they do want to provide the opportunity for both divisions to compete against each other. You may know the criteria for selection better than I. Maybe it is something you wish to bring to the attention of the USBC which would help moving forward.
The teams that qualified from sectionals should all be congratualted because they simply showed themselves to be the best during that weekend regardless of division.