If you're in, you could win.. THE POSTCODE LOTTARAAAYYY!
Edit: Waste of money as much as the standard lottery is. It's harder to know the odds, though I'd imagine they're be better than the national lottery. But since I play the national lottery now and then, I'm not about to start judging!
However, by signing up to the postcode lottery, you'd probably be signing up to a ton of junk mail too.
PMSL made me lol out loud here in the office, probably because ive seen enough of their ads so now i can imagine his voice when someone writes it down

