Make money by driving YOUR OWN car

Can we really do that? I mean it sounds too good to be true, right? But yes, this is the truth. While perusing an article about trying to make money in the recession-stricken times, I found this idea. The article said that by allowing different companies to paste their own sticker on your car's body, you can earn up to $900. Well, to be honest, in my part of the world, I have never heard of such stuff except for a van fully painted in U-fone logo, which frequents my area but does not that sound a good idea?