Why are people still doing this, if the probability of finding a private key that is used, is almost zero? Just look at the numbers involved with this in the following thread : https://bitcointalk.org/index.php?topic=104461.0

There are exactly 2^160 possible addresses and 2^96 private keys and there are only 2^63 grains of sand on all of the beaches of the Earth.

The odds in definitely not in your favour.