Q: Why don't you just post your email address?
A: That's one option, and it's a great way to get on spam mailing lists. Using a web form protects against automated address harvesting, and also helps keep emails organized.
Q: Do you read every email you get?
A: Yes, unless it's a million characters long. 999,999 characters long is ok.
Q: Do you reply to every email?
A: Time is always in short supply, so I can't guarantee a response to every email (and some emails are just too weird!). But if you put a decent effort into writing me, I will make a decent effort to reply.