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A good start up has a good business plan. Making money from your business can be a very interesting endeavor. But you have to at least be interested in the product in some way, or else you'll eventually give up.

Phil Knight started Blue Ribbon/Nike as reseller of Onitsuka Tiger shoes from Japan. He was clearly in it for the money. But he was also a track runner and believed in the product himself.

You also really don't need to change the world with a product. Just make something you want yourself, or something that adds value to people's lives. It doesn't need to be a billion dollar idea. Just something useful.