I don't know. The lower income people I know seem to watch more TV than the higher income people.
With the Internet, I'd guess lower income people might be not be afford it. Then again, alot of the lower income people do have Internet access and cut spending in other areas. I also see alot of lower income people coming into the library to use the Internet where they can access it for free.
I think lower and middle income people probably spend more time on the Internet for entertainment purposes. Higher income people, I think, would spend more time on the Internet for work related purposes. That's just my guess though, don't take anything I say seriously.