I think many people who frequent the "scene" are concerned that what is shown in the release post is what is actually in the release. It can be frustrating to spend a lot of bandwidth downloading something because the screen caps look really great only to find that what you downloaded isn't the same quality. People with less experience may not understand what TS, telesync, etc. really mean or that they are a big clue about a release's quality. I saw telesync and TS in your post right away, but others might not notice, and they might not notice that the last three screencaps came from a different source than the first three. Maybe if you say something like "These caps aren't from the actual release but they show some nice scenes from the film" there would be less confusion.
Don't get me wrong! I'm glad of any pics someone wants to post - it sure beats finding them myself.

Your efforts are appreciated, lara.