I am not a pattern designer, but I am a quilt maker. I don't think a pattern designer should have any say on what you do with a product made from their pattern - you did buy it afterall. They have made their money on the sale of the pattern, if they want to make money on the sale of the product, they should produce it and sell it themselves.
That being said, I don't sell my quilts or handbags that I make, I give them away. I think the only time I ever got money for a quilt was when a friend wanted a quilt I had made and I let her pay for the longarm quilting.
We could all use a little extra money (or a lot - lol) and I think as long as you don't sell a pattern that you purchased, then you should be able to do whatever you want with it.