Considering the fact that I was the only one in this thread who used the words "thank you" I think I am meant by your criticism.
I do not express my thanks here depending on whether someone is my "friend" (whatever this could be in a totally virtual community) or if he is some unknown stranger. I had a comment to Spike's upload (I recognized the film "Reality Porn Series 1" and liked to let the other members know about it) so I thanked him on this occasion. On the other hand I knew at once that I already had the scene that Sazas posted, so it did not seem of particular value to me (but probably to others), hence I did not thank him.
Please do not let you mislead by some sort of "jealousy". Keep in mind that all good contributions here are welcome, but not always particularly by those that already have a big collection of Silvia's footage. Probably most of the lurkers here do not answer a single time, maybe they do not have an account in the forum at all. So if you know you made a good contribution then you also can be sure that you made some people happy, no matter if these people thank you or not.
I would say Thanks to every single contribution, in Monterrey México I have not too many options to buy Silvia's DVD's. I lost the few ones I use to have and now that she is retired I don't know how to get. So this fórum is excelente.