I know this is a few years old, and I hear what you're saying, but just because an OEM manufacturer makes oil filters for multiple companies does not mean they are the same. They have "lines" setup to make different products for different manufactures. In some cases, they have multiple lines setup for the same product. A prime example of this would be something like a kitchen faucet:
Line A: Builds the base of the faucet (common parts what that may be)
Line B: Builds faucets that use brass/metal washers, internals, etc. that go to Kitchen & Bath showrooms or other "high-end" retailers.
Line C: Builds faucets that use plastic washers and internal parts that go to big box places like Home Depot, Lowes, etc.
Line D: Seconds or "re-man" products that go to bargain stores, Amazon or who knows where...
The same can be true for oil filters. I do know that a lot of companies are forced to sacrifice quality in order to sell their merchandise at Walmart. Just look at Mongoose bicycles. They used to be one of the best in the 80's.