also always be carefull with the high end of the estimates, especially for the older players, and when the values are very wide appart.
if you get an estimate of 700k to 850k, you can safely assume that is prety close to correct.
If however you see an estimate of 100k to 1M, you can bet that the real value of the player will be very much closer to 100k then 1M, and the 1M is WAY overpriced...
They are not your friends; they dispise you. I am the only one you can count on. Trust me.