Reasons:
1. Coins listed on coin market cap are more reliable to invest in than coin yet to be listed on coin market cap/being offered during initial sales.
2. Lately most ICOs are scam.
3. Lately most ICOs do not reach their soft cap. Hence, chances are, you may either get you money back same or depreciated or loss it entirely
4. Coins listed on coin market cap have been listed on most trading sites. Hence, you get the chance to participate in any form of trading you desire.
Caution:
Before you invest in a particular coin listed on coin market cap
1. Take a careful look at the price graph of coins and decide which coin interest you
2. Read more about how to invest in your desired coin. the pros and cons.
3. Work your way out to make your first investment.
Before you invest in an ICO,
1. Gain indepth knowledge about every aspect of the Project
2. Ask yourself whether the Project is worth your investment?.
3. Ask yourself would other people have interest in the project?
4. Ask yourself whether, the project has greater chance of hitting it soft and hard cap during token sale?
5. Measure your level of suspicion of scam behind the project.
Remember: if soft cap is not achieved the project becomes unsuccessful, Hence your investment might be interrupted
If soft cap and hard cap are achieved, probability of the team running away with your money is pretty high.
Therefore becareful the kinda ICOs you invest in
The above is entirely my opinion. Please share yours below if you agree or disagree
But you have to remember that altcoin you invested is ever to held an ICO past from now lol
For big profit you should invest on ICO and do a long hold, but also a bigger risk