I think the main reason that those industries are interested is that a lot of the tools/apps the user base works on is through a secure web portal. Any data access behind the portal is limited so that it can not come down to the local device. If you think about it a good example is employees who use a "thin" computer like a Wyse terminal. If they can access the same apps/session behind a secure web portal from a DMZ based wifi network on their personal equipment who cares? The data that matters (financial or medical records) is still secure and only available inside the company data center and it never really leaves the secure environment. Obvious downsides are any local keylogger program and/or spyware that takes screenshots but there can be additional checks/scripts run from the web portal to minimize the threat of those attacks.

So you are the reason the market crashed in '08!!! :)