If the business is still on the early stage whereby its just coming up and still trying to grow, at this stage it would be totally unwise to start taking out profit, it is until the business can fully stand on is own that is when you can start investing some back in and taking out your profit as well.No. I feel its not wise to re invest all you profit on a startup because the idea of investment is for it to speak for you even when you sleep. So i believe even if you will want to do such it will be best to keep some back and invest the rest