I guess you guys are attempting to ask a range from general acting to thought-provoking/very specific questions relevant to us as amateur VAs, like our typical recording schedule or how/whether we intend to branch out into other types of work or styles. Like last week's, you could ask choice questions (ex. would you sell your stuff to afford new equipment?). A pattern that works really well in generating questions asks for the most extreme (ex. what's the most you ever spent on equipment, what's the most ridiculous line you ever had to say). I think there are definitely questions out there to be asked, although you might have to get creative. The more interesting/debatable topics will probably get more attention.
I wouldn't necessarily change anything; you guys are doing a great job so far. Sometimes people just stop paying attention to something for a while and are pulled back in when it gets interesting again. It'll probably get a lot more active when the summer comes and people have more time.