one of the most overlooked reasons are people who cannot or will not move to where their skill set can gain employment. some of the cannot/willnot are married couples and that is understandable.

then throw in some who hold their skill set to highly with no basis in reality. just because one XXXX language programmer can get a set figure does not mean they warrant it let alone near where they live. I have seen people turn down jobs because they did not like the drive. Damn, you need the job, you do what it takes to keep your family whole!