Common problem is these people (who just do their job and make no trouble) are often seen as useless - you don't hear much about them anyway, what are they getting money for at all?? And the fact that their stuff just works makes many people think that they were just lucky to work on much simpler stuff than others - and you know, when code is done and works, especially a high quality code - it looks very simple, a buggy spaghetti code looks a lot more complicated and someone writing it usually has an easy time explaining a non-technical manager that he is working on very complex stuff...