What I've found is the value of these samplers usually ends up breaking even. You'll probably get a few nice sticks, a few decent sticks, and a bunch of dog rockets. It's not in a business' best interest to sell a bunch of premium sticks for nothing. I normally shy away from "grab bags".
That being said, if it's for a bachelor party, I'd definitely go for it. Most of the guys won't care, or won't be sober enough to notice, and you can snag the couple nice sticks. If you're expecting 20 premium sticks you'd be disappointed, but if you're expecting the aforementioned you'll get what you paid for. IMHO, this is perfect for a bachelor party.