Would this count as commercial use?

I was hoping to get some clarification as to whether it would be okay for me to use the Giant Bomb API for a website I'm building.

It's a kind of bargain sharing website influenced fairly heavily by Facebook but instead of friends you add and post on game pages. Currently I am using eBay as a source for games and store no other information apart from the game's name, but I would like it if I could include thumbnails of the game covers and was planning to get this data from Giant Bomb. I'll be making money (not very much mind you) from Google AdSense, affiliate links and the odd campaign when someone wants to advertise. Although this is primarily a way to monetise what is essentially a hobby interest. Would this still come under the definition of commercial use?