I've had my $400 used Aeron for 10 years at home and it is as good as new. All that time I have seen at least 5 lesser chairs crumble underneath me from normal

I've had my $400 used Aeron for 10 years at home and it is as good as new. All that time I have seen at least 5 lesser chairs crumble underneath me from normal daily use. Do the math.