And for me it as better to start buying those coins has not listed yet in CMC but if they listed in Exchange site could be have a high prices be happen.
These are high risk coins you are talking, the fact that they are not listed yet, that means they don't have good volume on which exchange they are currently trading, or they are just listed in one exchange alone. Well, you need to be careful if you plan to do this, though you can get them at their lowest price but there's no guarantee that they will be a successful coin, that is why it's called a high risk coin/s.
I don't like investing in high-risk coins because these are very easy to manipulate, and if not careful, you will buy at a very high price compared to reality. I think it is necessary to evaluate it carefully and invest only when the project is really good in the near future. For me, I only invest in new coins from IEO projects as proposed by high liquidity exchanges because those are coins that can help you earn big profits.