What about games that offer additional (similar) content for a fee? Seems like it'll be hard to draw a line without excluding some otherwise great games.
Example: Ascension: Chronicle of the Godslayer on IOS. It's a card game similar to Dominion. You get a large deck to start off, but can buy additional decks (which offer new game mechanics) for a fee.
Example: Ascension: Chronicle of the Godslayer on IOS. It's a card game similar to Dominion. You get a large deck to start off, but can buy additional decks (which offer new game mechanics) for a fee.