here's something from my experiences: a few times i have released things, and not responded to questions/comments about them for some time. not because i didn't care, but actually because i cared too much. to the people, those things were interesting curiousities, but to me they were things that my reputation was attached to. and so i felt that my statements, responses, and actions had to be well-calculated. and i had to consider the things themselves, which even by their lonesome were no walks in the park. it was somewhat daunting, which led to procrastination

not saying this is exactly the case here, but i remember this footnote: http://www.paulgraham.com/startuplessons.html#f2n