Here's a baseless graph that John Resig of jQuery fame included years ago in a speaking session: http://i.imgur.com/1OOcg.png.
Developers are inundated with "ugh; IE sux" propaganda, but the complaints are rarely quantified beyond "my site breaks in IE".
Further suggestions to let us elite middle-class types feel superior to others:
1. Extra 25% surcharge for anyone who shows up at your cafe wearing Crocs
2. Anyone driving up to your hotel in a Pontiac Aztek has to pay a fifty-dollar uglification fee
3. If a fat person shows up at your store, employ a security guard to stand around going "Ha ha! Fatty fat fat fat" until they leave.
It would be reasonable to charge extra for anyone who enters a shop with a beautiful wooden floor wearing spikes on their shoes. Spikes induce extra maintenance costs - so does IE7.
But yes, agree the work/personal related thing, they can easily buy at home and if the workplace has such an antiquated attitude to these things then they probably also have your internet access to watch and lock down anyway.
You're free to do whatever you want on your own personal time. You don't have to shop online while you're at work (and it's a huge security risk to do so), so complaining that it's inconvenient doesn't really fly.
(but still a valid comparison)
[1] http://www.heraldsun.com.au/news/reserve-bank-is-investigati...