I am asking this because not everyone has made tangible profit for holding. Just like myself I end up selling at a loss most times just to solve a problem. Some might be lucky to buy at a low rate and within few weeks or months the price just pumps to their favour. This kept me wondering if Bitcoin is actually for every one or it is a scheme for selected individuals..
Bitcoin is an investment tool. Anyone who wants to make this investment can do it. There is no specific limit. Once you learn what you need to invest, you can buy and sell at any price you want. Bitcoin does not give priority to some people.
If what you are talking about is at what point you should buy and always make a profit, there is no specific answer. The market is open to everyone and sometimes there can be speculation. After watching the market for a certain period of time, you can make your own decision and invest.