Whar the hell is wrong with Sales Forums and Sales Blogs?

I have been trying to log on to sales blogs and sales forums. There easy to log on to, but everytime time I do, they ask me to sign up. Why do I need to sign up and fill out a form when all I am trying to do is give my opinion or give advice?

Does anyone have any suggestions on this matter?

I have filled out some blog forms and of course I am now on they’re mailing list. Most of these blogs ( at least what I have found ) are companies that are trying to get my business.

All I like to do is blog and discuss on a forum without feeling like I just filled out a form to be sold too.