That's what I did. It's cheaper to subscribe to cable and get internet than just plain internet. For me, here's how it goes:
For cable internet (no TV), cost is $69.99 a month.
With basic cable TV and cable internet, cost is $53.69.
Strange how Comcast works. Im' getting more service and paying less. I guess it's a package deal. I'll pay for cable TV in that sense.