Ideally, being nice and respectful IS a transaction ---- that's how life and society works!
Be a law-abiding citizen and follow the rules = avoid jail
Be helpful to your friends and coworkers = you get support in return
Show foids that you're a respectful, non-criminal prone, and hard working man = signals decent husband material
But the above is only IDEAL now. People that like to say bEiNg nIcE dOesN'T eNtitLe yOu tO aNyThInG are usually immature and have problems with duty and quid pro quo