"Don't base your entire business on another business' product. " Well another angle to that could be it's ok if you plan on getting out while the going is good

"Don't base your entire business on another business' product. " Well another angle to that could be it's ok if you plan on getting out while the going is good by selling to a greater fool. This is one of the detriments in life to knowing to much. You tend to shy away from things (because of past knowledge and experience) that someone with less experience might do. And they might, by luck, make out. For example if you operate in old school business the idea of going forward with an idea not knowing how you will make money simply doesn't make sense. But hey people have done that and they've made out.