I too like the idea but fear it is near-on impossible to implement as others have suggested.
My expectations were low on this, because it seems near impossible to perfect. I like how there's a few comments on the valuation, which gives it the chance to be a useful tool.
HT's tool is also only somewhat useful, even though there's a larger database of players and skillset's are much easier to value.
"Well, no ones gonna top that." - http://tinyurl.com/noigttt