Good article to read and interesting points, but I'm afraid I will need to disappoint you, your facts about screenshots are wrong... only amateur would do screenshots like you explained but I guess those checkings will make you to catch some occasional fakers, which is again good...
Thanks guys, i just want people to be careful, especially newbies who have little knowledge about how scammers work. This article maybe a bit generic for experienced webmasters, but not everyone is experienced.