The only way to stop it is to have a rules that you have to read before you can post and then a quiz that you have to take and pass showing you read the rules.
Seriously though, I've been here 6 years. It's ALWAYS been like this. ALWAYS. And it's never going to change. In fact, it will likely get worse. The internet has people getting used to an immediate answer to their questions and then they blow. Especially now with all the "support" discussion boards. "Hey I got a 293hrx and I can't get it sync with my palm. Anyone else have this problems" The 5 guys answer them and they never see that board again. People don't get that this is a community with rules. And just like any other community people have to get to know you before they're going to help you. Especially with a source. Except the scammers of course, they are a newbie's best buddy.
I love this statement:
They go to people with lots of Karma thinking that means they have been here longer or know more about AAS which is not true at all.
This is so true. Before Karma you could pick someone out as knowledgeable by the time here and the number of posts they had. Then came the Chat board where you could run up your post count into the thousands in a couple months by posting "yeah that sucks" 3000 times. So post counts were no good anymore as an indicator of knowledge. Then the Karma came and it looked like a pretty good idea. You give it to someone for a good answer. So you know who gives good answers because they have lots of Karma. Now you can buy it, win it, trade it, whore for it, and even get Karma just for saying, "yeah that sucks". So we're back at square one.