The only publicity that such a suit can generate is bad for sales. In the case of Halo, everyone who even remotely pays attention to the video game world knows what it is and what's it about (in part due to Microsoft's $10 million dollar advertising campaign [I'm pretty sure I read this in a news article]), so there is little to be gained. What such a suit can do, however, is make all the parents think twice before allowing their kids to buy it. If parents heard is was violent enough for a lawsuit, surely it must be too violent for their kids, and they didn't bother to give it an actual chance.
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If you need an adult friendly rating to find pr0n on the internet, you have other issues to deal with.
The ftc and the credit agencies set up a site for... well just about everyone: http://www.ftc.gov/bcp/conline/pubs/credit/prescreen.shtm
The only publicity that such a suit can generate is bad for sales. In the case of Halo, everyone who even remotely pays attention to the video game world knows what it is and what's it about (in part due to Microsoft's $10 million dollar advertising campaign [I'm pretty sure I read this in a news article]), so there is little to be gained. What such a suit can do, however, is make all the parents think twice before allowing their kids to buy it. If parents heard is was violent enough for a lawsuit, surely it must be too violent for their kids, and they didn't bother to give it an actual chance.