The Boat.

Say, one day you decide that you want to be the captain of a ship. You don't have a ship. So through trial and error, you build a ship. It isn't perfect, but it floats and barring bad weather you could sail it around the world. You need a crew, so you put together a small adventurous crew who trust that you built a sturdy ship, albeit an imperfect one. So you set sail, around the world... and slowly but surely your ship falls apart. You and your crew repair it slightly as you go... but the truth is if you don't make it to the next port, then you and your crew and your ship will sink to the bottom of the ocean... We're heading to port!

The moral is... ships have little resale value!