Old barber joke, shortened.
> You've just arrived in a new town, seeking your fortune, and you need a haircut. In this town, there are two barbers. The first barber has a neat, dapper haircut. The second barber's haircut is grotesque Which barber do you want to cut your hair?
> Answer: You cleverly deduce that the first, well-groomed barber couldn't possibly cut his own hair; therefore, he must get his hair cut by the second barber. Thus, you correctly decide to patronize the second barbershop.
The sloppy designer is too busy making money from paying clients.
Disclaimer: over 90% of the websites I visit cram text into a narrow column, with too small to read fonts, often with gray text on a slightly darker gray or a white background, truly inane graphics at the top, and idiot nags. I use readability, or a print style sheet with almost all web pages.