ValueChecker isn't active anymore it seems.
In a nutshell, it's pointless trying to scrape/compile all the data yourself. I've done it and it's very tedious. Because all the feeds are different you essentially have to write a tool for every single bookmaker and keep on top of them... It took me a good couple of months to build something that's fully automated and I've only covered football!
I'm in the process of writing a bunch of guides that will be available (for free) to help people with this kind of stuff. It's actually quite straight forward if working from a tutorial or if someone shows you how it all works