Many of the people at the minyan have the passion and the commmitment that is associated with Chasidim. At the same time, they are Reform in that they are free to experiment with non-Orthodox halachic modes of expression. Religious passion and seriousness alongside religious freedom make a very powerful combination. It's a great credit to this synagogue that it fosters an environment where this can happen. In modern society we have lots of choices - about a million of them on a Saturday morning.
People have choices.
Shabbat competes with the mall, the golf course, and all other forms of entertainment. But when it's done right, there really is no competition - Shabbat wins decisively. You can have it every week at home and in Hershenson Hall. I have never met anyone who regretted having Shabbat in their lives. I have met a lot of people who are sorry they don't.