If your move is good enough for Dan and Dave then it is most likely good enough to be sold independently. But, lets say someone stumbled upon just one move, a colour change for example. It's a great change and it's the only thing they came up with that could be marketable, and they want to create a dvd.
Well a dvd or download that only has one colour change that is sold through some not well known company probably won't sell well, unless it's the colour change to end all colour changes. And it only takes one bad DVD for someone to be completely forgotten about, or get a bad reputation.
I believe it would make sense to market it with D&D since you'll get lots of exposure, more-so than an unknown site, and people will associate your magic and yourself on better terms. Even if you don't get the cash.
That's how I look at it.
-RA69