I received this information in an e-mail from Cilla Raughley, District Executive,
Pacific Central District of the UUA as a correction/elaboration on my posting about the Mystery Worshipper program at the Los Gatos congregation. "Our Mystery Worshipper program was not created by Los Gatos, but they were our first congregation to use this service. We charge $100 in return for two visits from our highly trained volunteers [the fee goes directly back to them to cover their expenses], spaced about 3 months apart, and two very comprehensive reports."