I'm noticing many applications are much less expensive on the Mac App store, than buying them from Apple.com or my local Apple store, even Amazon. I realize downloading the application reduces Apple's cost for packaging and paper documentation, but the Mac App store prices are significantly lower. Aperture 3 and the iLife applications come to mind. If I had an issue with an application and needed to reinstall it, this could be a problem if my Internet was down, using the Mac App store version. Having the actual disk would eliminate this issue, but not sure it's worth paying a lot more money for. But I guess from a Global warming view point, it makes sense to eliminate the carbon foot print caused by shipping and packaging.