For businesses, the hardware cost of technology is much smaller than the investment they make in their workers or software systems. Having multiple interoperable hardware vendors to choose from in addition to an OS obsessed with binary backwards compatibility made Microsoft/IBM PC clones the obvious and safe choice. This created economies of scale that inevitably shrunk the market share of the other systems (Commodore, Atari, etc). Apple only managed to hold on by dominating the education and creative markets.