I think the answer is the same for most art -- I was told by a very fine teacher to "never ever buy art as an investment, buy it because you love it and want to make a life with it -- if you love it, your life will be enriched each time you look at it -- even if it's stuck in a box or under the bed. If it ever becomes more valuable, your heirs will be thrilled, but don't ever buy because you want to make them rich."