According to me, the strategy you have provided is definitely foolproof but not unique. I have seen more people using the same strategy. However, thanks for sharing it with the community. Definitely the newcomers will be helped from your post. But I think investing on ICOs while you are already investing on coins lowers the risk of making a loss if you have done your research properly.
I have not heard about such a strategy before, if it exists then it is surely talked about. 9 out of 10 posts I read around crypto investing indicate zero strategy behind them. Posts like "if I had 1000usd, should I buy Ripple or Stellar?" The average crypto investor lacks diversification as much as a proper strategy. But these are the 2 main things that will help you to get an ROI instead of getting burned.