There are some people spending 10 ether on each ICO after analysis of course and triple their money each time.
You must make sure that the ICO will get listed on a good exchange platform.
Once is on you will just sell.
I recommend that is best to join ICOs at the whitelist period. This way you will buy at a better discount price and once on platform. Just sell unless you believe that there is potential for further growth in that coin.