You know what i think the biggest problem is here, I dont think its that people are to lazy, (well i do think that but i dont think its the cause.) I think its that everyone thinks their situation is special or unique. For example, people will come across a problem and think, "oh, my water looks good, cant be wq" and post a thread, sure enough with a little test and wc, the problem is solved. Or, another question which I think is common " oh, well i have two expensive filters on my 90g, i can put a ray in that then right?"
I think thats another big root to our multiple threads that are more or less exactly the same.