I agree that there just isn't a whole lot to talk about. CoS has nice arcs which are several episodes long but all get neatly tied up at the end. Further, most of the questions anyone would ask are in the patron videos anyway so there's no reason to ask them.
I think what would be really cool, is to have an AMA every so often with a cast member. For example for CoS it would be cool if the guest would do an AMA after their arc finishes to talk about their character. Obviously you would have to get buy-in from the cast to do this, but from what I've seen most of them end up loving their characters enough to want to participate in such a thing.
I actually check the site fairly regularly, but for me personally I'm less of a talker more of a "take my money" kind of a person.