You should only worry about making your site compatible with IE6 if your website will attract a large demographic that is prone to using that particular browser.
For example, if your site sells rascal scooters you may want to put in the effort to make your site compatible.
Some people just take a look at the w3 browser statistics and think that since the number of IE6 users are decreasing by the day, that it isn't nessecary to make their site's compatible. Although the current percentage of IE6 users amount to only 7.9%, your site (if it appeals to those of a certain demographic may have predominantly IE6 users among the audience).
It all depends on your website, at the web development firm where I work, we disregard IE6 comparability except for blue collar business sites.
btw a lot of people have no other choice when they surf the net from work and school computers which are on networks run by lazy administrators who don't like to update 
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