Our group goes to a couple games a year and then sell the rest. Don't have the energy for any more than that, it's a long day.
Weather is not a major factor for us, but it is THE issue when you are trying to sell them. But I think it goes beyond just the weather during the game where a dome would help. Driving in the weather sucks, especially with stadium traffic. And tailgating isn't as pleasant either, a major factor for many.