As well as the cost of replacing vs loss of life as u/VeinPlumber points out, I'm not sure of the stresses that occur when a launch escape system fires, but I imagine it is significant, like how ejecting from a jet puts extreme pressure on the pilot and often injures them. If that's the same with launch escape, then the technology in the spacecraft might not survive a launch escape or would be unusable afterwards. Satellites are designed to withstand certain pressures and temperatures for a certain amount of time during launch, while still ultimately functioning as intended. Add the wacky stresses of a launch escape and it would ruin whatever is in there, maybe. An engineer can correct me. But if so, cheaper and more straightforward to focus on successful launches than designing technology anticipating a failure.