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A very real cost of having a Mac is that one can no longer take the install disks from school/work/friends and install them on their computer. I realize there are free alternatives to just about everything now, but things like Matlab CAD programs just don't exist in the free software world (that I know of). I know this is piracy, and if already installing from someone else's disks, why wouldn't someone just torrent the install? But really, that's riskier. Your friend isn't going to turn you in, or piggyback a virus. I think this is a large and unreported factor in weighing the cost of a new computer.