Claude,
Your last message is insighful:
You seem to have little problem taking liberties with time of others (Calvin for example, as you've referenced him a few times), but with your own time, it seems to be a different story.
Suppose others felt the same way, that because of existing contributions, that they'd 'done enough already'?
Suppose one of the individuals you've referenced came up here and said, "I think I've done enough"...I imagine you'd be somewhat discouraged.
If it's 'outside your range', perhaps you should think about 'expanding' it? Sounds like an opportunity...
Kevin