I have never paid for time building.... period.... and I took the long road... I ran out of money when it came time to do the cfi thing so I up and moved to fly wx mod and from there I was hired into the right seat to fly freight around the caribbean.... furloughed there.... went and flew pipeline back in TX for a while and recently was hired by colgan..... there is absolutely no reason to pay for time.... none whatsoever... like others have said before..... you are a commercial pilot... you need to be paid for your time and effort to earn that certificate. End of story.