I agree with others that e-mail by hand is a pain in the ass, did it when I first started. After I went to form/automated, got alot more done. Bots are going to find forms, whether they are e-mail or script. Least with captcha you have a fighting chance. Like Greenguy said, too much copy and paste, ect.
I am with others, when I come across submits that need to be e-mailed, I move on as well, guess I am missing out too..
Not to mention, e-mail is no where near 100%, if your concerned about losing submits, I'd be more concerned losing e-mails.