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For every ying there is a yang, or something like that.

Check out this list of 10 Totally Stupid Online Business Ideas That Made Someone Rich, which is a list of improbable ideas which appear to have made a few people lots of money, courtesy of the internet and the Long Tail. Who woulda thunk:

• antenna balls for your car?
• sunglasses for your dog?
• dating service for HIV singles?

Not on the list are pre-internet brilliant-but-stupid ideas of the past such as pet rocks, leashes for invisible dogs. You never know what will sell apparently, so best to try everything that pops into your head.