Considering the amount of original material in Alien Invasion, the reprinting of a few feats is pretty forgivable. Hell, considering what the particular feats are, it made perfect sense to include them in the book.
Psion, it may be just $3, but it's not just money. It's a vote. By spending money on a product, I am telling the producer of said product that it is a financially viable product at least once. Even if I am the only one to do so, it is still a vote; it is still a badge of consent that the publisher can use to say "some one will buy this."
If Covert Ops is a rip of feats from other sources without any original content, then I do not want to tell the publisher that such a product is worth my dollar to purchase. If it is not such a product, then I will likely vote with my dollar to show my approval of such a product. I do not vote uninformed; thus, I do not make uninformed purchases. It wouldn't matter if the price were a penny; paying for a product sends a message.
Mind you, I'm also a guy who looks into the ethical practices of the businesses he shops at; I check the tags of the clothing I buy to make sure they are produced locally or in first-world nations. I vote with my dollar every time I spend a dollar. My RPG purchases are no different.