I can't see why they claim to be unsatisfied either. - Perhaps they are unsatisfied with their lifes (as in "The wife found out!
").
The only thing I can imagine is that they expected to see more hardcore shoots by now, but you explained perfectly well why they don't happen at the moment.
You shouldn't feel pressed to do more. Do it with your own pace and your chosen partners. The more relaxed you are about it, the more we will enjoy it, too.
Asking the "unsatisfied" customers what they think was missing could be interesting. It would show them how much you care.
I don't think you can ask every one, though. You could ask one or two dozen and see what responses you get. (I think not even half of them would respond anyway.)
I think the vast majority of your members is very satisfied with what they get at your site. You are truely unique in the business. Don't let a few grumpy people tear you down.