It may not work out well for the Town Of Mammoth Lakes in a low snow year.
SoCal Mammoth pass holders who would normally go to Mammoth might decide to save a few bucks on fuel and lodging and go to Snow Summit which has become known for having excellent snow coverage due their availability of water from the lake and high tech snow making systems. The price of the pass is nothing compared to the expense of fuel, vehicle wear & tear, and food and lodging. The people who really scored on MMSA purchasing Bear & Summit are Bear & Summit pass holders who take a few trips to Mammoth a year. Now they save the expense of having to purchase lift tickets. IMO