Defaults can trump quality more easily than you might think. There are several better web browsers in existence than Internet Explorer, but since IE is the default on Windows, that's what a staggering number of people use. Lots of other programs out-perform Adobe Reader for displaying PDFs, but, again, it's the default program and that can mean more than quality. If a default option is easy and works well enough, very few people are going to go looking for the best option, or even a slightly better one.
Mokalus of Borg
PS - This is also how a lot of fast food places stay in business.
PPS - And a fair few TV shows.