I've heard of a couple of accidents involving light planes with skydivers on board in which nobody survived. Even with optimum conditions (trained parachutists, wearing their regular and emergency chutes, with the door removed) it's simply not feasible (usually) to evacuate the aircraft in an in-flight emergency.

The fact that trained skydivers would prefer to remain in a crippled airplane and ride it down than try to bail out at low altitude speaks volumes, IMO.