New window or not new window?

Some things you click on open the page in the same window or tab of the browser.
Other clicks result in a new window being opened (such as clicking on a profile when on the PM page).

I just thought I'd ask why.
No particular reason.

A small donation to the forum may fix this conundrum.

http://www.polishforums.com/support-the-project.html

From your post there, it looks like you'll be expecting a cut of the proceeds.
Advertisers usually have a slogan or maybe a jingle to enhance their point.

Charity begins at home Donkey :-)