I've been approached by so many people with the next "big idea" in the past and after a few bad experiences early in my career, almost always say no. A friend

I've been approached by so many people with the next "big idea" in the past and after a few bad experiences early in my career, almost always say no. A friend of mine once had this great idea and I decided we should turn it into a business. I worked on it for a few months and when we are about to release it, he told me he just didn't have the time to work on it anymore and moved onto a new venture. The problem is that he had no skin in the game. He had put no money or time into the business and so moving on was very easy. Another problem is that a good friend is not necessarily a good business partner. Most people don't have what it takes to see a business all the way through.