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I am going through my old answers (from when I was new to SO and didn't know better) to delete the ones that make no sense.

In doing so, I discovered that I my reputation increases if I delete my old posts. However, I discovered further that the second and third posts that I deleted earned me +6 rep, while the first one earned me +8 rep:

Non-deterministic ++rep when sequentially deleting own posts

I'm not particularly concerned about the +2 rep difference between the two; I'm just trying to understand why they were different. Can anyone clarify why this may be the case?

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The first two had 3 downvotes each, for -6 score. The second one had 4 downvotes, which gave you -8. When you removed them, you got rep back accordingly. – NullUserException อ_อ Oct 15 '12 at 15:47
up vote 5 down vote accepted

If the posts had downvotes, you lost 2 rep with each vote and get it back when you delete the post. Since you've recently been awarded Peer Pressure I know you've deleted at least one post with 3 or more downvotes. 3 downvotes, no upvotes would cost you 6 rep which you would get back on deleting the post. For 8 returned rep, I guess you had 4 downvotes and no upvotes.

Good call deleting those ones I'd say :-)

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Your guess is correct – NullUserException อ_อ Oct 15 '12 at 15:54
    
in theory, the post could have 1 upvote and 8 downvotes, or 2 upvotes and 13 downvotes, etc – Kate Gregory Oct 15 '12 at 15:55
    
Yes, but I can see the posts. – NullUserException อ_อ Oct 15 '12 at 16:01

You'll only gain reputation when one of your posts is deleted if it was down-voted (and down-voted significantly more than it was up-voted).

See: How does "Reputation" work?

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