Because the sticks keep getting lighter. Lighter sticks are lighter due to less materials thus making them more fragile. I'll never ever buy a top end stick. If you notice, they are the ones that are always breaking. Case in point, Easton RS vs. Easton S7. I know guys using the same S7 3x a week for years and these are big, strong guys that take their share of slap shots.
Try getting 2 years out of an RS. Lucky to get 2 months.
A few months ago I broke two sticks within a few games of each other. With one, the blade snapped when it got stuck in a crack in the boards and the second it just split in two when I blocked a shot (stick on stick, not puck on stick). They were both nice sticks too, it was depressing . Otherwise, no.