Good question. The LPs were basically a lot 'newer' than the 78's, thus not as worn. Some of the early 78s (especially the 1948 Aragon records) were made of a shellac-based finish, easily worn by the heavy turntable's tone arm and steel needle of that era. Add that they were played a lot and factor in that some of these records were 65 years old! These were very popular recordings of the time - simple wear and tear, stacking them on a turntable and having the records drop down upon each other (the automatic changer of the day) caused excessive wear. When vinyl replaced the older 78 predecessor, they were also made to be longer-lasting. If, somewhere, somehow, other pristine 78 RPM records become available, we might digitize and re-sample these. (But remember please, this has been all volunteer work).