In the last few days I've noticed several closed questions getting deleted. This would be unremarkable if I had been noticing a steady drizzle of these all along, but I haven't. Maybe this has something to do with how I noticed the recent deletions, which is by some unusual rep changes. That would only happen if I answered a question that was ultimately closed, and had non-zero rep from that answer.
However, this brings up the question of when/if closed questions are deleted. Many closed questions are total crap, and I'd expect them to be deleted quickly. Others may be poorly asked, but yet gather some decent answers. Does the system just delete all closed questions eventually, does a mod have to clean them out, or something else?
For example, see DC Motor reversing relays using a micro switch. It was poorly asked and I can see why it was closed, yet Andy and I both wrote useful answers that I don't remember being covered here otherwise. If a automated process eventually deletes closed questions, then that's just the way it is, but if a human looks at each one, then what's the criterion for deletion?
Related to this, there seems to be a bug in how the rep change from such a question is accounted for. I got one up vote and one down vote on the deleted answer, for a total of +8. I'd expect to loose that 8 when the question is deleted. Yet the rep for the day shows both a -8 and a -2 for that answer, which I don't undertand. On the other hand, the rep total for the day looks like it's calculated for a net -8 due to the deleted question. Please understand I'm not quibbling about the miniscule rep difference, but either there is a bug to be pointed out or I've got a misconception about how the system works that I'd like to clear up.