Xfinity makes tv packages listed at certain prices (yours signature @ 129.99 PACKAGE PRICE meaning thats the base without taxes fees or equipment). Xfinity will not pay for any fees like any business those are passed to customers. Broadcast TV or Local broadcast channels (NBC,ABC,FOX,CBS) change the prices they charge to comcast based off their ad revenue, money they take in, ect. They continue to charge more as less people watch to stay alive and increase the rates to Xfinity who charge you them cause again businesses pay fees but pass them down to customers. Before you say that you dont watch them and get rid of them, its a package Xfinity cannot sell channels by itself, and frankly doesnt want to. A company like Disney owns Fox channels and ESPN and will sell in their own packages to comcast, for example disney will sell fox news to xfinity but they will also need to take fox sport 1 and 2 for hypothetical example and then xfinity will make packages with all those channels based off viewer tune in. As far as Regional sports fees its a similar situation, this "signature" package you have is the same "package price" in MA as it is for most of the east coast. in New england we have NESN ( new england sports network) and NBC sports boston, those are "our" regional sports and they similar to the broadcast networks charge various rates based off ad venue and viewership. if you go to other areas of the county there is the Big Ten Network, and others i dont know about and they charge xfinity different rates than what the new england channels do, and again this company does not pay fees and will pass these down the line to customers.

to OP get rid of the cable box and get xfinity stream app and buy a modem and router saves at min $14*12+ $168 a year (cost of a modem once). Or go get a channel guide, find only the channels you want and what packages they fall in, find the minimum requirement to fulfil that and downgrade. OR go to streaming... for now.

TV is expensive and will only continue to get more expensive, its a dying media who knows that it needs to increase costs to live long enough to jump to a streaming company, who may or may not even keep their content up to get paid. Also having alot of streaming services will make the argument that streaming is cheaper will go away.

source: FORMER xfinity employee dont harass me I haven't work there in many years