Hmmm, my mind is seeing the situation......I love mind seeing situations........ so the cloth is woven on machines that do 75 threads and that fabric isn't in demand so there is more of it available and the manufacturer doesn't want to have that equipment at a stand still so made a darn good deal to have plenty of the 75 available guaranteed. The 60 cloth may or may not be available when needed but cost less when it is.
Moda has more new fabric lines then any other fabric manufacture. I don't think the quality of the fabric will be bad, just different. I'm willing to buy and try.