Yes. For example I downloaded both Call of Duty 4 and Crysis and played through them both, and then went out and bought both of them. The reason being that they were good games and worth the money. It's the same principle for Memory Map, if I had several hundred pounds lying around spare that wasn't needed for something else, then I would buy it.
Another good example is Centrafuse, the front-end software for the CarPC I'm building into my Focus. I downloaded it, tried it, liked it and I will subsequently buy it when I come to do the final fit this summer after Uni. This will cost me several hundred pounds.
Anyway, that's quite enough arguing about the ethics of software distribution. I respectfully agree to disagree.