I'll Take A Crate!

Only £7,200 a bottle, it's a bargain!  What I don't really understand though, is a standard 75cl bottle of Cristal 2002 is £290, and six litres is equivalent to 8 bottles, so I could buy exactly the same amount of overpriced champagne for £2,320 if I went for the more convenient to refrigerate normal sized bottles.  Or to put it another way, I could buy 24 bottles of exactly the same overpriced champagne for the same money as the giant bottle.  Could it be the bottle is worth £5,000?  Because it doesn't look that great.