Trade value is a tricky thing.
It's tricky because we, as Celtics fans, always rate our players based on what what their value is TO THE CELTICS.
It's tricky because we never see the other side of the coin, the team we are trading with. That's how you get the "trade for DeMarcus Cousins" threads without ever thinking about whether we have anyone Sacramento would be interested in.
It is easy for us to say that Avery Bradley has trade value, because he is our best young player on the squad. How do we know any other team views him that way? It is easy for us to throw Sullinger in a trade - because he has value to us as our best draft pick the past 2 seasons. Why would we think that the 20 teams that passed him up in the draft would now reverse their position and make a trade for him?
That's why I am generally in the camp of keeping the status quo. I think trades rarely ever work out in your team's favor. It is easier, and more conservative, to go with what you know. That is not to say I am opposed to trades, just that I accept they are risky and many times irreversible.
Having said that - it is clear to me that our trade value list goes something like this:
MVP - Rajon Rondo
VCCs (Veterans for Championship Contenders) - KG and PP
The 401k (things you hope have much more value in the future) - Bradley, Sullinger
Ex-Girlfriends (you can live without them but they might make you regret it) - Jeff Green, Courtney Lee
VAs (Vets for Anyone) - Jason Terry, Brandon Bass
Home Improvements - Fab Melo
Scrap Heap - Jason Collins, Leandro Barbosa, Chris Wilcox