I got a lot of sarcastic arrogant messages back from the developers about the fixed bars over the years. I did some research but I have to check again. Some of them on their Linkedin profile use to work for media advertising corporations and as I dug I through I saw associations to Mindspark kind of things and as a technician I use to manually remove the dodgy browser toolbars that are associated with these aggressive advertising firms. Sort of see a pattern there.
I questioned them that I don't want these things stuck my screen constantly. All I want is to be able to close it without using Adblock, I showed them a good example, archive.org and they turn nasty, dodge the issue, insulted me further, like talking to me a like a dog and called Adblock harassment in itself and started moaning about it becoming evil and killing their revenue.
They ignored me when I showed them a thread I started on Adblock forums asking for help in blocking the Ebay basketbar and I clearly stated I don't use it to block adverts.
It appears that some of the developers who work for websites and implement there bars are overzealous and the type would say "I am overqualified for the job" and can do what I want and think of what the user/ guests want.
