If it made my skin feel nice and soft, I wouldn't have a problem using soap made with BM.

Good point you raise about supply v demand for donated milk. You would need to have a lot of mums donating to keep it viable and that there were no shortages. Also, what would the cost of the service be or would for prem babies would it be Gov funded? Price could be a determining factor as to whether Mums use the service or not