Comparison Sites Like Broadband Expert, Are They Profitable?

This morning I came across a very interesting new comparison website, Broadband Expert. The first thing I came across was the Broadband USB devices (mobile internet devices), which are affectionately know as dongles here in the UK. The site allows you to compare speed, download limits, monthly contracts, prices and even reviews from other users.

However, one of the downsides is that it only compares 3 of the UK mobile companies, 3, T-Mobile and Vodafone. It would have been nice to see all of the network sites in this list. Additionally, I would really like to see this done on a global scale and not just for the UK market.

This has always made me wonder, do these comparison type websites actually make decent money? Do they receive the majority of their revenues from direct display advertising on the site or is it mostly from affiliate earnings ever time some purchases a contract? I never actually thought they would work, but I do keep seeing tv advertisements for comparison websites like Confused.com. For example Confused.com keep quoting that they have 5 million people use their site for quotes last year, but this seems like a tiny amount. How can they be profitable from that amount of traffic? What are there revenue streams?