So if they all utilise the same data, then in theory they should all spit out a similar value?
lol not in the slightest.
Here are the following valuations for My Local Forums.
www.getwebsitevalue.com - $109,592
www.websvalue.com - $25,742
www.sitevaluecalculator.com - $64,720
www.cubestat.com - $14,681.76
www.yourwebsitevalue.com - $88,285
www.websiteoutlook.com - $17,410.50
So basically, put your finger in the air, and double it

If anyone wants to offer $109,592 then I accept

My personal favourite is cubestat.com
$14,681.76 how on earth did they get to 76 cents?