Some admins have a lot of custom modifications and just haven't gotten around to upgrading. I only finally upgraded my 3.6 board to 3.8 in January - I skipped over 3.7. I was just lazy and I also had some custom mods that I hadn't gotten around to testing until December. Also, the big change in 3.7 was the social networking stuff and a bunch of sites didn't need it so they weren't in a rush. But, 3.6 is not end-of-life and so admins are thinking about upgrading (which is a large part of the reason I finally pushed myself to upgrade my site).
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