A few of the threads in the past that I've read have dealt with card prices in the past and how certain cards go up, or down, price-wise the last several years.
I just read an interesting Wall Street Journal article
http://online.wsj.com/article/SB1000...googlenews_wsj
And they tracked several cards, some pre-war, based on value change in the last five years. I was surprised to see very little change, but some of the yields were, in stock market terms, outstanding! Take a look