picking up pennies

Is it worth the time and effort?  I just picked up two pennies while grabbing my laundry, so it got me thinking...

Each time I pick up a penny, I get one cent (which I put in a box and never use, but let's assume I'll use this penny).  Stooping down and picking up a penny takes a few seconds - three seconds if everything goes well, but it could take longer since pennies aren't all that easy to pick up.

Five seconds per penny means I the action "earns" me 20 cents a minute, or $7.20 an hour.  It's not terrible...  at least not until you consider how you should probably wash your hands afterwards.