It's possible (not guaranteed, though) that “waterline” for minimal quality of things that you find interesting (rewarding) will rise (note that LW/sequences is relatively high quality already, though wouldn't yet try to define “quality” here), up to the point when approximately all (with more and more rare exceptions) things on the internet can be seen as boring-because-unoriginal (i.e. they start to become repetitive if seen sufficiently generally).

The idea is based on a very small (<4) and very selective sample, of course, and general extrapolation wouldn't be very helpful (though if you don't find sufficiently interesting some simple reading of fixed set of newssites with no search for additional materials — “morning newspaper”-like, that's already some suggesting indicator).

The “community participation” is a case where such rewards-decrease is almost guaranteed to not happen (though it's also a stable need anyway).