So what if its just "a few pounds" to buy the codecs? Most computer users don't know what a codec is, and its a case of endless hours pulling hair out trying to figure out why their ridiculous computer can't even play a DVD.
Quicktime Pro doesn't just enable full screen capabilities (which, as I've said, no one in their right mind would want or need, anyway), so you can't claim Apple crippled the standard version just to screw £20 out of their customers. Funnily enough, it enables professional features which most standard users do not need and I'm sure Apple have reasons to charge for (commercial codecs for encoding, etc.)