SteelSeries CMO Kim Rom talked to ARS Technica about DPI in gaming mice, and revealed higher DPI in a mouse doesn't offer a lot of value.
Rom's argument is a simple one: go to a tournament where professional players are in the running for serious money. These are people with something real at stake, who know how to choose their equipment and settings for maximum performance. "Ninety percent of the expert gamers there will be using a DPI value between 800 to 1,600," he said. If you paid some serious money for your gaming mouse, check out its stats: it's likely it can do some multiple of 1,600 at maximum sensitivity.