Interestingly, you can get a cheaper promotional rate if you bundle local TV channels (cheaper than $75/month for both internet + tv) so Comcast can inflate its video subscriber (to boost their stock price) amount and they hope you forget you're on a promotional rate your bill jumps $30-40 after you drop off promo. You're free to negotiate (most people do) to get back on the promo rate; many people have success with this, but it's just a cat/mouse game and a hassle.
And Comcast also has a 1TB monthly usage cap. When the era of 2160p + HDR arrives in the next few years, people will chew through that cap rather quickly.
Comcast will continue to jack up standalone broadband prices to hedge against fleeing video subscribers. Why? Because they can, and have very little competition in most markets.