Interesting... a few months ago I noticed exactly the same thing. I've begun walking a half mile further a few times a week to a Safeway rather than go to the Trader Joes two blocks from my home because of this. (I refuse to use store club cards, so I don't encounter the trouble you have with them).

I actually prefer some trader joe's branded food to the alternatives, but it isn't worth it to go there. Food from other stores simply lasts longer, which is essential when you are buying for just yourself.