Earlier quoted context omitted.
With a loose schedule (once a week), you may risk losing viewers who forget to return. What about scheduling something relevant for almost every day of the week? e.g. (and just making this up as an example) Monday - new video goes up Tuesday - you moderate/seed/encourage some commentary and follow-up questions Wednesday - interviewee responds in a specific follow-up entry (bit like Ask Slashdot or whatever it was) Th…
I don't have much to lose yet, with all the success on HN I have only 2 feedburner subscriptions so far. But your advice is good, I will definitely give it a thought.
You could look at paid spots though, especially if you had more than one interview a week. A tech company might pay your hosting bill for the month if allowed to feature one of their developers?
Another thing might be trying to complement a HR service and make yourself valuable there. Can't think of anything off the top of my head, but a bit of brainstorming might uncover something.