Not true. Check your bill. TV+Internet might be cheaper when only counting the base rate of TV, but when you get TV you also get tons of fees piled on. FCC fees, Local Cable Access fees, Franchise fees, Cable Box fees, Taxes, etc. It will be different depending on where you live, but when I added up all the fees it added almost $15 extra per month just for basic cable.
It's still cheaper to just pay extra for internet without cable TV and get an OTA antenna.