I suppose that might explain all the looks-nice-but-not-very-strong furniture around too, then - they can't skimp on the labour or man-hours because the thing still needs to look good in order to sell, so they start cutting corners in the raw amount of material used. It doesn't save them much, but they figure it's better than nothing.
(I suppose it's not that big a deal to me, because I can always strengthen things as/when needed without altering cosmetic appearance - it's just a little annoying that I know I'm going to need to do that in a few years, when something of supposed 'good quality' built a few hundred years ago would have gone much longer without any attention)
cheers
Jules