Nes Suno , Apr 14, 1997; 11:05 p.m.
I have not personally dealt with York Photo, but it sounds exactly what Seattle Filmworks does.
Seattle repackages Hollywood 35mm motion picture film and sells it as "professional" filmstock. Motion picture film is non-archival and degrades very quickly when not frozen (before and after processing).
The film is cheaper to make, cheaper to process. If you use motion picture film, don't expect to see the same images in five years.