In your opinion, when a new altcoin is created, how many coins is just too much? I have seen projects with like 10,000,000,000,000 coins. That looks almost like... a spam coin :/
Well, a good rule is to plan for the future. Check coin circulation and actual price and market cap, and now try to project these numbers 10 years from now. What is a likely marketcap that it could reach? 1 billion? 10 billion? Those could be realistic figures. Even 200 billion could be realsitc. But if you think your coin could res h 1 trillion all by itself, then probably there are too many coins in circulation, so the price will never be that high