DC has its ups and downs too. As have other areas in life.
Until the beginning of 2009 I was very active and quite enthusiastic abouty DC and stats and so on and I have been that from my start in december 2001.
Then something happened - all the stats became a burden, the expectations of my TeAm-mates were suddenly just somewhat too heavy to bear, until I realized, that it was my own expections, my own ambition. I almost quit crunching, sold my computers and ... but I continued crunching, not doing stats because ity was no fun ... Some times I feel that I have let down the team mates, but quite a few of them assure me that I did not. Now the fun is coming back; slowly, but it is. I'll probably never will do as much stats as I did before, but I will do them more or less.
I asked myself: why?
Well, I do not have an answer which is valid for all. One part is that it is quite a lot of work, and there may not be enough time. Stress in RL (work, family) contributed in my case a lot.
But one part is also the development in the DC-community. Quite a few of my really close friends are much less active now than they were before - and I miss them a lot. Some have disappeared totally. And it takes time to make new friends - and that has happened. Some "adversaries" have disapeared too, and it takes at least two to have some good exchanges of friendly banter in a forum. We also had a slump in activity in this forum, for some (small?) part due to my inactivity, but also due to the disappearence of other valued members. The change of a guard is not easy, a change of generation has quite some impact on productivity.
An othe part adding is the growth of DC. Whern I started we were some 100 000 crunchers around the globe, probably less. Now we more than 1.9 million, I think, and almost 5 million hosts. That takes a lot of growing pain. Then the nature of the teams has changed: quite a few do it for the competion, the stats, and less for the science. Now some teams have 10 - 20 thousand members - which was unthinkable before. Our team has less than 2000. Similar fate has hit many of the other "old teams": the Cows, Team Starfire (our old competitor), just to name two ...
One other point is the ease of BOINC. Before BOINC, and when BOINC was young, you needed a lot of skill and knowledge to run the applications, which often were "command line". There were switches, batch files, tweaks and twists. Now only Folding@home is such an application, and that one has grown very complicated --- if you want to squeese out the most. And because BOINC is so easy more people crunch ... which makes us more anonymous ...
So: to make it short: there are many causes for feeling the DC-blues. Some of the personal, some of them relational, others systemic.
I think we need challenges to get forward. Races among our selves but better against other teams. We need to mobilize the TeAm-spirit and we need to reconquer our self esteem as one of the nicest and best teams in this universe.