Too many lost and damaged packages and hence too much money lost via refunds. Tried to claim insurances (all were insured) and was always denied either because post did not process the claim in time and it timed out, or because I couldn't prove damage happened during shipping, or because "I should have used the ultra-expensive express service for fragile items". Got tired of this shit.
Dutch post retardedness might not be China-specific, however. Sold/shipped some mems to websmile (to Germany from Netherlands with tracking and insurance), the package somehow ended in the UK where it was lost. Accoding to PostNL, it somehow ended being my fault, so insurance claim denied.