if someone wants to be contacted they'll leave their email address in the profile.
Otherwise the reddit guys and other high profile guys who post on here would get constant emails from people with great ideas which they just know, will make them MILLIONS!
It can be frustrating trying to contact someone privately on here without an email account listed, but I understand that (the more recognized) people here might not want to have their emails open for the unwashed masses, but a PM system would work around that, but the people here are smart enough that they could create and post an unused secondary email address, but users can always comment asking for contact info or submitting theirs...
...it basically goes in these logic circles forever. I'm fine with leaving it the way it is (save a few modifications to the profile screen so that the users know email addresses aren't publicized), that way, if someone does contact me, I'll know that they know their way around Google and the rest of the internet, and that pre-qualifies them :)
In my case it was because I didn't realise it would be difficult to contact me without posting my email address.
I like the idea of pre-qualifying people who are willing to put in a bit of effort but some text in the registration form would probably be helpful to any new users.
Otherwise the reddit guys and other high profile guys who post on here would get constant emails from people with great ideas which they just know, will make them MILLIONS!