I am glad I am not the only person wondering about this! I sell in sets of 4's and 5's currently (Ii charge 1 dollar x # of buttons for the sets), with a few "u-pick" style listings available (6 for 5$, 12 for 10$, 18 for 15$ and 24 for 20$) so the more they buy the more I make in one sale and the more they save at the same time, works for everyone and so far so good with that, I did several sales in my very first week which I was not anticipating.