I don't see the problem. HTTPS is basic internet hygiene. It's no worse than telling people they should mind their body odor when they're in a space with a lot of other people. Possibly indelicate, but undoubtedly true.
I for example just wouldn't like anyone to be able to see what data I exchange with any server, be it small profile blog or a login page.
Note: It's really, "see and modify undetected" what data you are exchanging with any server.As for what risk, two words: Great Cannon. For those who don't know, it's a well-known MITM attacker which injects JavaScript code on non-HTTPS pages, the injected JavaScript being used to do distributed denial of service attacks on other sites. Using HTTPS protects against these kinds of attacks.