Willingness to learn is proportional to investment

Applies to games of all sorts, from fighting games to investing in the stock market.

The wilingness to learn how the system works is directly proportional to the investement of the player. If a game requires 30 min of tutorial to get it going, many will drop of as the learning requirment exceds the time invested so far. 

A good product will delay learning requirement until the user is more invested.