Hmm. Well I think people use knoppix for different reasons, but if you're simply saying that people are attracted to knoppix because, unlike traditional distributions which involve a higher level of risk due to partitioning, all you have to do is boot from a cd, then i agree.

One point you may want to consider though is that Knoppix DOES have a graphical partition application which is just as easy (well probably easier) to use than partition magic. It's called qtparted. Because qtparted can be used with Knoppix you don't even have to install it on your hard drive (unlike partition magic).

Personally I started using knoppix because it has an easy way to install debian and debian is frankly the best distro around when it comes to an a really great package management system (imho).

Others have their reasons, backup, rescue, security analysis, quick and easy server setup...there are really a lot of good reasons to use knoppix.