Why not use HTTPS for everything?

Question

If I was setting up a server, and had the SSL certificate(s), why wouldn\'t I use HTTPS for the entire site instead of just for purchases/logins? I would think it would make

Answer 1

One other small point (maybe someone can verify), If a user types data into a form item such as a text box and then for some reason refreshes the page or the server crashes out for a second, the data the user entered is lost using HTTPS but is preserved using HTTP.

Note: I'm not sure if this is browser specific but it certainly happens with my Firefox browser.