Why is there a Campaigns to kill web browser

There seems to be a campaigns to kill the web browser that are not Internet Explorer 7 .

Most 95 % of web will work but people tell me that 5% and growing of web sites are blocking user to they make a upgrade.

Is this some kinda of kickback? I mean really if I'm web master I may make a web site for Internet Explorer 7 ,Firefox 3 ,Safari 3 and if you do not have it:cry the web site may not look that good on other platforms but to block you from that web site.

What is next block windows 200 and Me to everyone gets vista or XP? There must be some kickback with the web site and microsoft.And yet there are ways of getting around the site compatibility issue.

 

I use Iceweasel (firefox) and a few times I have been told my browser does not meet the sites requirements-comcast,,wellfargo...etc
I now use a add on called" User Agent Switcher", lets me spoof the site into believing I am IE6,IE7,win xp,win vista...etc works wonderfully.
A site that only keys it's site to IE& is not going to last long.-

Petaluma