I believe your fears are well founded however, it's because you have a good pocket that is why you target those top 100. ICOs are risky yet they offer better returns to investors. Compare PARETO. If you invested $10,000 about four weeks ago, today you would be having over $350,000. How many top 100 could give you such returns?
Everyone do have their own unique strategies
That's depends on project, not all can give you huge return. established coin also worth for look. If you buy dether some weeks ago you'll get 10x return now