Wow, you really hate VZW. Why do you continue to do business with them? It isn't as if you can't get a Galaxy Nexus that will work on either the T'Mobile or AT&T systems.
I don't hate VZW and I am not the person you addressed your comment to, but I think the reality is that the cell phone carries have an oligopoly and because of their market power, one is not really much better than the other. Also, in major metro areas all of the carriers may provide equal coverage but those of us in suburbia or rural areas many times don't have a choice because 1 carrier dominates with respect to coverage.
So if I had to guess I suspect the person you were referring to continues to do business with VZW because he either has no other comparable choice in carriers due to coverage in his area or because the other carriers would have the same or similar problems in his area.
Or maybe he gets a discount through his place of work or gets his phone through his place of work and has no choice at all.
Lots of people talk about the carriers as if they are no different from any company selling a commodity like bread. But unlike the bread manufacturers, the cell phone carriers have an oligopoly and it is an oligopoly obtained because they bought certain frequencies of the electromagnetic spectrum from the federal government. No such similar issue with bread manufacturers. Anyone can bake bread and sell it and if your bread is tastier and a better price than the other bread on the market, your bread will be preferred by consumers who can very easily stop buying any bread but yours.
Not anyone can transmit a cell phone signal at a particular frequency. So in addition to the oligopoly issue, the problem with the cell phone companies is that they are public utilities by virtue of their licenses to use portions of the electromagentic spectrum but are not regulated as such.
Making microeconomic arguments with regard to the carriers without recognizing the oligopoly/public utility distinction is not valid.