Some other reasons I can think of why people are still using IE are;
- Live Connect is sometimes very unstable and some people still like to use the old Remote Control module, using browsers other then IE for "Remote Control" can be a real annoyance as you have to download an executable every time you want to remote a machine.
- Google has also locked down their browser since Ver. 21 so it has become more difficult to get the KLC plugins to work for some people so they like to fall back to IE that will at least work some of the time.
- If you use more than one Kaseya VSA it is easier to use different web browsers as you keep having to reinstall the KLC plugins if you use the same browser.
(Starting to see a repeating theme here, *KLC*)