my niche is gaming news, and occasionally reviews
Everyone knows that the closer your site content is to the "buying cycle", the more money you can make with advertising. But there are still plenty of sites which are purely informational which make some money from advertising. Especially if they are popular and have a lot of traffic. I guess these are the types of sites where interested-based advertising pays off.
I suppose it depends on your goals. I'm not clear if you already have a gaming news website, or if you are thinking of creating one in order to earn some money. If you already have the site, my opinion would be to put on ads and see what happens. If you don't yet have a site, and you are needing to earn some money, it may be wiser to choose a niche that has more earning potential.
That said, I'm still of the opinion that you will likely have more success in creating a popular and useful website if you work in a niche you love. I simply couldn't create a good website for (for arguments sake) reviews of plumbing supplies, even if that was the highest earning niche around. Picking a good niche is not the only aspect to earning money -- the site has to rank, and that is less likely to happen in an area you find boring.
I know many people will disagree. :)
If you don't yet have a website, you also need to bear in mind that it generally takes several years before your site will be able to earn anything more than pocket-money from advertising.