With regards to the no talk sans proof "rule" it's largely because people were extracting the urine on a regular basis.
"Oooh game X is fantastic, i've completed it already"
"how did you play it, it's not out anywhere yet"
"my aunt in america sent it to me as a birthday present"
"your 8th birthday this year, and what time travelling courier did she use this time to get it to you at about the same time it hit the warez servers, a month before release?"
Or
"I bought/watched it in america"
"when"
"a couple of days ago"
"you must have a few million air miles, you visit America about 3 times a week, getting home in time to post from your home connection every day, are you sure you're not a drug smuggler?"
The rule is annoying at times, even for the mod team, but people tend to ignore polite requests that they don't go shouting about the fact they've just downloaded "bloody gunz 27" from "OMGL33t Warez"