I'm curious to see if this is a bug. I was the one in 86 that asked. I traded for a WR with a trade value of 2000. Once the trade was completed his Value went to 650.
Several of us looked at trade values for this WR and another and all saw different numbers.
basically the trade values were representing personal weights and this happened with a change to the website. According to JDB this has been corrected so hopefully it won't continue to happen. I personally like it better when it represents our weights but you would have to be in a league of really active owners to negate the unfair trades with newer players. I hate having super productive players that the AI rates low and are untradable despite their great production
