Well these higher speeds will help get you into overages that much quicker once Comcast gets their merger approved and starts imposing the caps they say they won't. Make the overages $10 per gigabyte and they will pay for Time Warner in no time.
So apparently the 10 isn't going to 20 in the new 105/10 tier afterall, so thanks to your point I think it's time to save $10/mo. by going back to 50/10 here.