Some decisions get made for you
I've been hemming and hawing over doing a Goodreads giveaway--you have to do paper books for them, so that's a lot more expensive than Library Thing, where it's e-books that cost nothing. But my sister asked for a copy of the new edition, and of course it's much cheaper for me to buy it, and so then when I was ordering that copy I realized that shipping is actually really cheap on multiple copies. So I got ten, and I'll give away eight or nine on Goodreads. Might as well.