Could there really be any easier way to serve, than by paying me? You don't have to worry about social nuances, about having completed a task 'well enough', you don't have to invest much of your time, or energy; you simply have to PAY. Click a few buttons, and you know you're *guaranteed* to have made me somewhat happier, somewhat more satisfied with your existence, exchanging power to me in the most tangible & efficient way. Why WOULDN'T you pay me?!