I think you hit the nail on the head. This is a professional machine, and the professionals it is aimed and, that are going to be buying this machine, are not i

I think you hit the nail on the head. This is a professional machine, and the professionals it is aimed and, that are going to be buying this machine, are not interested in upgradability in the sense you talking about. Find a good price/performance ratio, buy and use machine for 2-3 years, sell and buy a new one. The fact that this machine houses all the components you want to upgrade inside of it (CPU,GPU,RAM,PSU) and all the components you want to keep outside (NAS/RAID primarily), makes this prospect that much better, less waste. Not to mention the usually excellent value retention on Apple hardware makes this a pretty darn good investment. Again, if you are in the target market that is.