To poker players, clients are a game and anything that can be done to gain advantage about the rules of the game (generally speaking, the laws from the land), is fair simply. If you love negotiating “gambits” (lowballing, goodcop/bad cop, red herrings, nibbling, etc.), and sales “tactics” (101 effective closing techniques, 30 tricks to finding past the gatekeeper,etc.) you could potentially well are categorized as this educational.