Legacy of the Kallic Diaspora
When players spend experience, they have limited restrictions when spending on Characteristics, Skills, and some Talents (mainly normal characteristic maxima).
When a player wishes to spend experience on Perks or Powers, they need to go out and claim those abilities from the world. If he wants Contacts or Favors from a group in the game, he needs to invest time on those groups. He needs to help craft the fiction on how those abilities are gained.