Even if you wanted to argue that the customers deserve more compensation than 50cents per month because of the real estate used by the modem, considering they can easily take up less than a tenth of a square foot, plugging that into the average square-foot rate for real estate in the area where the customer lives would probably only amount to perhaps a only a few additional pennies per month. If you factor in the notion that it would not be reasonable to compensate them for 100% of that, becuase the customer is getting some use out of the modem as well, it probably doesn't even work out to a whole penny.
Wow, it's a good thing that absolutely none of what you mentioned any where in your post has any impact what so ever on what is in effect a real estate agreement between two private entities. Unless Comcast suddenly qualifies for some kind of federal housing allowance that I want to allow them to use, the average square-foot rate for real estate does not come into play any where at any time. If I have no interest in charging a rate that is "competitive" for use of my property then I don't have to, if they do not agree with my rates then they are free to go somewhere else. The law is quite simple in this case, it's "pay up or fuck off" in other words capitalism at its finest.
This isn't about how insignificant the price of electricity might be, or what a fair rate to reimburse customers is or any of that crap. This is the fact that their company wants the ability to use property I own to make a profit. The physical location that I own has a value to them and they have to pay the rate that I charge (which by the way would be a hell of a lot more then 50 cents a month) because without my cooperation they would not be able to offer coverage for this service in the immediate area. Give it a minute, some idiot right now hasn't read to the end of this sentence and is thinking "Well it would be unreasonable for Comcast to negotiate private contracts with each of it's customers blah blah blah...". My preemptive response to this oblivious person is simple, I don't give a damn. I simply don't care about what is or isn't reasonable to expect or economical for Comcast to do, their convenience is absolutely none of my concern. My concern is the use of property I own to make a profit. Can you see the flaw in your retarded excuse of an argument yet?