1. What is the difference between PhotoPost pro and photopost vbgallery? http://www.photopost.com/compare.html
2. If I were to end up getting all the products you have and put them on one site, would have 4 different admin sections, could they work together?
You would have 4 different admin sections as they are separate products for separate actions.
3. Any discount if I buy all of your scripts at one time for one site?
Yes if you buy 3 scripts or more at a time there is 10% off every script you buy
4. I am a registered user. I did buy the classified script. How can I become a verified member here in the forums?
The announcement at the top of every single forum on how to become verified should assist you with that.