With Tradewars, I have had no interest in adding "Bluffing/Deception" as a expansion idea. I guess I'm not really impressed with all those games that feature it.
Yet at the same time, I would want to introduce a PYL (Push-Your-Luck) mechanic for the "Privateer" Expansion.
At the moment, I cannot picture any "Bluffing" - only that player take chances with the "commissions" to try to be the first player to reach 500 credits. It's pretty simple, each starship costs 10 credits to "commission" and gets a 5 credit "valuation" (no Tradeships).