I think I have two opinions on this, from different angles.

I think the phenylephrine stuff is absolutely messed up. I personally had no idea it was ineffective, and I've bought medicine with that included, believing it would do what it says it does in the active ingredients list. To me, this is criminal, and these companies should be taken to court for outright lying about their products. (And the FDA should be slapped, hard, for not having done something about this by now.)

But when it comes to the CVS brand of acetaminophen costing $5 and the NyQuil brand costing $10, that's just... the result of normal market forces. I'm not a big "free markets" guy (because we don't, and can't, have truly free markets, and if we could and did, it would be a disaster), but it's pretty normal and common for people to pay more for something just because some company did a better job advertising it than their competitor did. That's just life.

It's funny, because when I go to a pharmacy, the store brand is usually shelved right next to the big-name brand, and there's even often a little card next to the store brand (or even printing directly on its packaging) that says "Compare ingredients to $BIG_NAME_BRAND!" And yet, people still buy the big name brand. ::shrug::, that's life.