MoCA and paying for a second internet connection are two completely different things. With MoCA, you're buying a pair of adapters that allow you to use those same coaxial lines as your local network wiring. IOW, you're able to use your cable TV, cable modem, and network your computer devices using the same coaxial cable, all at the same time.http://www.amazon.com/Actiontec-Ethernet-Adapter-Service-ECB2500CK01/dp/B008EQ4BQG/
(just an example, not necessarily a recommendation)
There's also powerline adapters which use your home wiring as your network wiring.
Both these solutions are geared towards those for whom wireless isn't a viable solution (perhaps the distance is too great).