I'm not a customer of coding tutorial videos, I don't know either you or PeepCode. As an outsider looking into this market, I'd like to offer my totally unqualified opinion as follows: Upwards of $10 is too high. Yeah, you'll probably sell a few, but I believe the sweet spot for those kind of purchases is around the price equivalent to a cup of coffee in a decent coffee shop. It should be low enough that people don't have to think about the price-to-risk ratio, it's something they buy on impulse just to see someone do stuff with code. I believe you'll probably get way more exposure and, ultimately, sales from being low cost.
Also, consider putting up some short but useful videos (not teasers) for free, so people get to know your style and trust your expertise. Charge for the longer, premium content.