"Most Dutch bikes are old. Relatively few new bikes bought due to high rate of cycle theft. So relatively little demand for bike emporia, despite the huge numbers of cyclists? "
My expectation was just that but about 99% seemed to be almost new. From memory the population of Assen is circa 60,000 with the number of bikes in the town estimated to be either two or three times that for some reason. With that volume of sales perhaps the proprietors could afford to retire rather than work on doing maintenance :-)
But WC got my point precisely.