I'm pro since day#87. So today is my 10 day anniversary.

I became pro, because I wanted to support ipernity. Being able to enlarge images of non-pro-members that are uploaded on, say, 800x600 is one of the bonuses. Being able to offer huge original sizes to family non-pro-members is one other. Being able to see their original image sizes (if they allow it) is a third. And being able to upload large private files like ZIPs for archiving purposes without killing the monthly upload budget is a forth. So there are pro bonuses. Lots of them. But the main reason for me was that I wanted to support ipernity. Unlike with flickr there are no truly relevant limitations for free accounts on ipernity.

It was that, that encouraged me to buy the pro.