It was simply a question. No one else attacked saying how dumb it was. Usually these communities are for sharing whether it's what you found or where. I've been in other dumpster diving communities, and they say straight out what they found and where. It's helpful; however, of course not everything is the same everywhere.
I understand how you wouldn't want to point out all of 'your spots' to people because you may treasure them. This is understandable and may vary from person to person. All you had to do was not answer the question.
You can't just go around pointing out what everyone does, says, or acts as being stupid. I mean, you could, but that's a nice way to be a very close minded person... You can be close minded if you want.
Not everyone sees dumpster diving as being a sport. Some people are more than happy to share with others where they may find success. This question was directed towards anyone willing to share.. not towards anyone wanting to be stingy about it.
I'm glad you've found a sport out of this. I know plenty of people who do it because they refuse to put up with any amount of consumerism. Some of them do it because that's all they can get by on to survive. This is something that not everyone is willing to do, and it's something that most people have to be close minded to even consider. This isn't something that people need to be 'shooting' other people down for if they just ask for some advice.