Well they have consistently beat Comcast's pricing when combined with TV. Also their bottom tier pricing is better. Or better put, where we can get Comcast and WOW, Comcast lowers their pricing.
I have wished I could get WOW for over 5 years now...
They don't enforce any. But I've heard that if you're maxing the connection 24x7, for long periods of time, like a month or two, then you do get a warning. Nothing has ever been posted here about being terminated though.