No it isn't. The job I do, my value to the company, supply and demand, are how we agree on a number. If I buy a new car, my employer isn't going to start paying me more to cover it. If I move 20 miles further, they aren't going to pay more. On the other hand, if I take on a new job, or I'm promoted, or do something exceptional, or become difficult to replace? Then I get increases. But the fact that I pay for Gigabit at home? Why would the employer care about my costs? Makes no sense.