h2g2 The Hitchhiker's Guide to the Galaxy: Earth Edition

do you ever wonder wherer all the pens go anwho? They aren't all used up, that is quite obvious. I for one use more than 100 pens a year, i'm 20 so i've used 20000 pens? I am only one person, how many pens are lost per year? they haven't all been thrown away, not even a majority of them i assume, since no one will through out a useful pen? do the missing pens live on an island together, or perhaps exist in a secret cult wreaking havoc upon all of us? Does the pen that is all used up have anything else to write? hmm. these are the questions that i ask myself.