True, the bridge of your nose might appreciate the lessened weight, but to those around you, you'll still look like a goggle-eyed bandit. Compatible with Dolby 3D Digital Cinema screens, they also have anti-theft RFID tags so cinemas can try and stop the blatant pilfering which still seems to be going on. You'd think people would've tired of stealing 3D glasses for novelty kicks already.
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As far as I know, you buy the glasses and are welcome to keep them (at least is the US). Nowhere in the 2 3D movies I've been to does it say anything about being required to return them.