raztec: The mad rush to increase corporate profits. Keep making minor updates and try to render your previous versions obsolete.
I have LR3 and am doing just fine thank you.
I don't mind the annual minor/incremental updates as long as they adjust the price accordingly. Apple's OS X is a great example of minor/incremental updates between Snow Leopard, Lion, and Mountain Lion, but at least the updates were only cost $29 each.