There are some things that you should do to care for your wooden picks as well as a few things that you should not do, in order to maximize the productive life of the pick.
DO - Polish the wood pick from time to time, just as you do your guitar. This not only cleans the pick and removes the oils that can damage the surface and appearance, it helps restore the natural properties and moisture in the wood. This will enhance gripping the pick and thus increase its life.
DO NOT - Carry the pick in your jeans pocket and forget to take it out when laundering. This will damage the finish of the pick and many times warp it to some weird shape which makes it difficult to use. If you are lucky though, the pick will hold its shape. In this case all you have to do is refinish it. This is done with rubbing in a healthy serving of bees wax and caranuba wax.
DO - Keep your pick in your guitar case when not in use, returning it to the same spot after each use. This will ensure that the pick is available the next time you want to use it. Take it from experience, you will get addicted to some wood types and will feel completely out of sync and in a panic state if you cannot find your wood pick.
DO NOT - Let your friends try your wooden pick if you do not have extras for yourself. If you do, then make sure you keep it in sight at all times, because these little objects have a way of growing legs and jumping into friends cases and pockets when you are not watching. It is not that the pick doesn't like you, but just a case of your pick having lived a life of wild adventures and wanting to continue.