Plus, it's mostly the bottle that makes you feel fancy anyway. It's made of glass, rendering it needlessly fragile and also needlessly heavy, which raises freight costs. Then there's the cork, which some insist is a miracle material, but was actually just the first thing we tried after we got sick of stuffing bottlenecks with oily rags. Also, corks can leave a bunch of s**t in your drunk-y grape juice, which means that a cardboard box of wine is a better container than any elegantly corked bottle.
So the next time someone makes a comment about you buying three boxes of wine at the local grocery store, know that you're the classy one.