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For home users and small business owners that are torn between a tight budget and technological obsolescence, Apple largely is a dead end. PCs, on the other hand, lend themselves to upgrading with a bare bones system and recycling many of the parts from the old computer. The end result can be a new, current technology PC without throwing away hundreds of dollars worth of parts that still had plenty of life in them.
Large businesses typically don’t want to spend the time and money needed to do this with a large amount of PCs so this isn’t really applicable to them, but there is an even bigger albatross around Apple’s neck in this arena: competitive bidding. If they go with a PC platform, they can use their volume purchasing muscle to pit rival PC manufacturers against each other to get the best value for their money. If the go with Macs, well, they get to haggle with Apple without the implied threat of taking their business elsewhere (other than to a PC platform, which is my point).