We (this forum) represents about the 1-2% of consumers that try to be a little more informed about maintenance oils and filters. The vast majority of consumers just buy the cheapest oil filter on the shelf because "an oil filter is an oil filter". They don't care if it is a Fram, a Purolator, or a Chinese filter, they only care about price. So therefore, Purolator is likely doing just fine.
Case in point, Wal-Mart sells a TON of SF oil for 1988 cars and older, because it is the cheapest oil on the shelf. It is only FIVE CENTS cheaper than the SN Supertech oil, yet a large portion of the population are willing to buy obsolete oil for their cars to save the measly FIVE CENTS PER QUART!!