One of PE's major points was that Photo-Flo adds, I'll call them preservatives for lack of more knowledge about the stuff, to the film and these "preservatives" help protect the film for quite some time.

Yes, given Photo-Flo's very low cost and the fact that I went out and took the time to create what I hope are beautiful images, lovingly processed them in a darkroom, I'm not going to "just use soap" on my negs! For me, it's not worth it to go to all that trouble to save $.01 by using soap.