This just sounds like a bad idea, gone horribly wrong due to corporate America.
There are plenty of classes out there already, but there is room for more. But you won't be able to just sell 'a class' at a time. If you have a good set of ideas, write em out, and send them to a publisher to get put out there with some extra fluff, and with a good name on the cover so people might buy it.
I would never just 'buy a class' off a website, even if it was 10 cents...not to mention, if you're going to be doing this, you're going to be using credit cards (most likely) or paypal. Both of those services charge transaction fees. So you have to take that into account before you go setting prices too low. $1.30 may end up getting you whacked with .25 cents, so you're really not making that much out of it...and since even good PDFs don't often get more than 150-200 sales, you're not going to get even 50% of that being a website 'on your own' that isn't affiliated with a pdf sales site like rpgnow.