Value yourself

SO importance is interesting when it comes to pay. Jobs4Trade is valuing our services and an interesting realization came to mind. I don't think people get paid based on the amount of work they do or their value to the company. Pay rates seem to be based on how difficult you are to replace. So how can we use this in a job bartering and job trading service website? I dont know, but I plan to figure that out. Maybe replacing your services has a value, and perhaps it can be valued at how difficult it can be to find someone else without using our site???