Yeah I assume there's a ton of "we want ____ here, if you're not taking him we can trade" and if the team lies then their reputation is trashed.
Yup. Burning a bridge to hustle a team is bad business generally.
GM you burn in LA may have an asst GM that gets the Chicago job next year.
Now both think you are a lying sack of nickels.
It's quite OK to be honest and say hey we know you like this guy but we really like him and would offer X,Y and Z to get him.
Or we like player X and you like player Y how do we make this happen.
Hitting on your evaluations separates heat from chaff not outsmarting people.
Dallas fleeced Minny bad (send us player X, Y and Z but if they can't make our team or get snaps revert to picks in rounds 3,4,5 all while knowing he was cutting or sitting those dudes) then no one wanted to trade with Jimmy for years once the details got out.