Stumpin's a good way to pass the time. Broke one today myself. Shot at a tuft of a shrub, and my arrow went right through it, as I expected it to. Saw my arrow sticking out of the ground on the other side, and I thought, "Great! Don't have to look for that one!" But when I pulled my arrow out of the ground, I found that the tip was pushed back into the shaft, mushrooming the shaft. What I didn't see was a big ol' rock just beneath the surface.
Oh well, I'd much rather break one than lose one. When it's broken, it's done for other than what I can salvage off the old arrow. When it's lost, it's the start of a half hour search that day, followed by repeat visits if it seems like the arrow should be somewhere I should be able to find it.
Just the other day, I shot an arrow that wasn't there when I went to look for it. Fortunately, my friend noticed when I shot it that it ricocheted way off to the side, further than you would expect it to, and so we were able to find it. I'll bet most of the arrows I lose are for that reason. If they're within 10 feet of where I shot them, I generally find them, even if I have to drag the grass with an arrow finder gadget I carry with me.