The fact is that be it fees or donations, at the 60 GH/s that we seemed to have reached (or the <50 it was more recently), it doesn't amount to much. If Bitcoins were worth more, or if we had had more hashrate (say, finding a couple of blocks daily), it might have been worth the effort to keep going. But as things were, with Bitcoin value in the mud and the pool not really growing, it was looking improbable that the pool could ever even cover the server costs. It was an interesting project to develop, but in the end that wasn't enough.