I'm always interested in risk and probablity theory. Looking at my own purchases, the odds of turning up a '23' as the last two digits would appear to be 2.4%. That is about the same odds as taking a single spin on any number on a roulette wheel and winning. (That's a wheel with one zero, BTW.)

So it's fine if you're going to buy anyway, but the odds are not attractive enough to buy something in the hope of winning.

Steve