Fram sells because of their strong marketing program.
Nevertheless, the problem with Fram oil filters has been the inconsistency of their product because it is manufactured all over the world without proper quality oversight.
In my past business travels I have drive by Fram oil filter manufacturing facilities from South America throughout Asia. They have also had a high number of oil filter recalls throughout the years, including their racing oil filters in 2007 as shown in the link below:
www.motorstate.com/pdf/FramRecall.pdf