For situations where they need to run an entrance line, especially for fiber-optic entrances, the prices can truly be absurd. I previously was charged $12/foot for coax entry for a cable connection at a house that didn't previously have cable service, and they made no efforts to optimize for length, fiber is usually $25/foot or more. This is on top of an "service initiation fee", which was $500 for gigabit over coax, and would have been $2500 for gigabit over fiber. All told it was nearly $3k to get gigabit coax as new service at my prior house, and fiber would have cost me more than $15k, despite it all being microtrenched in an existing easement where the provider had right of way, no street crossings, and covered in part by state and federal subsidies on the back-end.
What these broadband regional monopolies do is basically double-charge for the same work. The state and feds pay them to do it, then they also charge the customer to do it, and they take no efforts to minimize any of the costs because there is no incentive to do so. The prices they charge are also outrageously higher than the actual cost of delivering the service. I was once a BICSI certified fiber optic installer. I happen to know exceptionally well exactly what the costs are for running that service. For what they wanted to charge me $7000 for, I could have done the work myself (including my former labor rates) for a mere $1600, which includes a healthy margin. That's also based on fiber prices from ~20 years ago, and things are much cheaper now from a materials perspective. There's really no excuse.
I didn't get Comcast.