Hrm...
I really don't see the issue. This is a discussion forum. There is a difference if someone says "I heard, or I think, or I imagine", it sets the tone of their post as conversational moreso than 100% factual you can take it to the bank.
It would be one thing if a lot of people were giving bad information, and no one was negating it, but most threads where someone makes an inaccurate supposition they are often reamed thoroughly by other members putting them in their place and correcting their information

@ Adam
Some people are experts, and others are noobs, but there has to be an in between somewhere. I have never bred a female, but if I hear someone saying what size they should breed a female at, I would say about 500 grams per foot, 3 feet, 1500 grams... only because I've heard this 100 times..
just my 2 coppers
Edit; Summary, I don't think first hand knowledge should be a pre-req for giving advice, as long as you acknowledge the source of your information...