Forty years ago, virtually the only differences between expensive and inexpensive cabinets were price and service. But Web-educated consumers have revolutionized this market by demanding full value for their money, in the shape of three-quarter-inch-thick doors, premium wood species, and convenient, long-lasting hardware. As a result, lower-end makers are rising to the design occasion, and upscale makers are adding higher-quality features to distinguish themselves and make their price worth the investment. So you get more for your money when you spend more on cabinets, mostly in the way of sturdy materials and quality craftsmanship.