When I look at the depreciation of MBP, it is much worse than a MP. For example, 2008 models of MP have depreciated by about ~50%, while MBP have depreciated ~75% for similar price starting price point of the computers. This is from a popular auction site. In general is this historically the case? Are MP in greater demand? It is interesting that it is a low volume model, but resale values stay high, meaning there is more demand on the secondary market.