Projects that will work only if they grow large generally won’t grow large; people who are fixated on creating large-scale future success can actually reduce the possibility of creating the small-scale here-and-now successes needed to get there. A veritable natural law in social media is that to get to a system that is large and good, it is far better to start with a system that is small and good and work on making it bigger than to start with a system that is large and mediocre and working on making it better.
— Clay Shirky, Cognitive Surplus
EVE Online is a good example of the former. I have about a dozen MMO examples of the latter.