You also have to look at often they see laptops. In this day and age I would seriously doubt that a single US flight goes up without at least one laptop on board.You can turn on the laptop, but in my literally hundreds of flights over the past 5 years (let's say around 300 flights in that time), I've been asked to turn on my laptop zero times.
The same is not true for game consoles. It would not surprise me if only 1 out of 4 TSA agents could even identify a game console.
In regards to how often they check, my wife has flown a grand total of once since the TSA existed. On a flight from Iowa to Florida she was required to turn on her laptop in Iowa and her connection in Atlanta.