According to Moore's law, electronics double in their capabilities every year to two years approximately. When looking at items of such as digital cameras it is common for a mid-range product to lose approximately half of its value in two years, based upon Moore's law. Differences occur when you look at top-end or low-end components as these are no long marketed for mass consumption. A low-end product may only lose a fourth of its value while a top-end component loses three fourths of its value in the same year or two. Overall the value declines rapidly at first, and then slower later. So, if you buy near the low-end you will lose less of the money you put in, but you may have a harder time selling. If you buy near the top-end you will lose more money, but you will probably have an easier