1. When I delete my old post (Bounty Spams) Do my activity will decrease?
If you have less Posts than Activity, your Activity will go down.Quote
2. When I delete my old post (Bounty Spams) Do my post on my profile will decrease?
Yes.Quote
3. I will delete only those bounty report post that has already been finished and been rewarded. Am I right?
That depends on how the campaign handles the reports. To be safe, you shouldn't delete them before getting paid.Quote
mam/sir LoyceV
Read this on the sir stuff 
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if I have questions about this forum?
Chances are I ignore your PM. It depends; usually you can find the answer by searching the forum, just like your questions above for that matter.That's why some people even call them 'pussy points'.
Google: "No results found for "pussy points" site:bitcointalk.org."