Why do some people show their email address beside their name?

You're only supposed to see the email address of your first-degree connections. Yet there are people who may be your second- or third-degree connections who actually show their email address.

Why?

It's probable that these people make a living by relying on connections (headhunters, venture capitalists, entrepreneurs, etc.).

Should you also display your email beside your name, so that your second- or third-degree connections can contact you directly?

I think so. It's not so much that doing so will help you NOW, but that there are so many opportunities to sell products and services to your connections in the near future.

More about that later.