I think we're saying the same thing. Just because an employer has to pay $100k for a job doesn't mean they "want" to pay that much. It's worth $30k to them but they can't find anybody near by willing to do that.
So they go looking for somebody willing to take the job for less. Or realize that the work isn't something they want to do and that consolidation is necessary and the only way to achieve that is through outsourcing the service.
We had a skill that was semi-valued but not at a full-time level. So management kept asking the expert to do other tasks that he really wasn't trained in nor wanted to learn. He left the company seeing no growth and was never replaced. Years later in the midst of quality problems a senior manager asked "what does John's testing effort tell us?" -- "Oh, John quit a year ago, we haven't been doing his kind of testing since."