That's a perfectly valid reason, though. For example, if you want to renovate a house that's built in imperial dimensions, it's stupid to try to force metric measurements onto it. If you've got a bar with an investment of thousands of dollars into imperial-sized glassware, telling them they've got to throw the lot out for metric is a waste of money. One of the other advantages of imperial over metric is that it is based somewhat on human proportions. So while you may scoff at a foot being the length of some old king's actual foot, the scale is human. The metric stuff fits a little wrong. A metre is too long to talk about height. A kilogram is too heavy for cooking, a litre too big. People in Canada adapted readily to km and degrees C, but for human-scale measurements there was a natural resistance, so that even now that we're on the second generation of kids growing up metric, people still use imperial measure around the house.