In that case, each individual here knows that some members use their right to anonimity, and should therefore post info/flyers/business advice accordingly.
If you are business people, then being a little bit careful should be important. I always use forums like this assuming the person asking could potentially be my nearest rival. I'm not saying do not help, just that a little caution is required. I would not post my website on here, that gives access to my home address, in the same way I wouldn't give a phone caller my personal details, even if he said he was my bank! Irrelevant of whether the people on here give their names or not!
Irresponsible to assume that by a member posting details of themselves in their profile, it would stop them from obtaining info, using info obtained, etc.