Take a look
here. There is no benefit to buying high speed ram for gaming.
What you are saying maybe true to some extent, but having DDR3 3000Mhz isn't going to double your FPS verse 1333MHz for example. Games are either GPU or CPU bound. I never heard of a RAM bound game.
@ Pete. $4 isn't bad. When DDR3 came out there used to be a major difference in how much it cost to even go from 1333MHz -> 1600MHz. The gap isn't nearly as much now due to higher speed ram coming out. I still have to correct people wanting to get 2133Mhz or something along those lines that costs nearly twice as much verse a 1333Mhz kit. I just hate people wasting money on computer hardware that won't add much to their experience.