Immigrants could bring them over to power some appliances they bring with them. I know a Dutch and a German family that have those around their places in Canada.
A selection of short adapter leads with Schuko sockets and NEMA 6-15 plugs would probably be ideal for that purpose. Only problem I see is that there aren't too many places to connect to in the average home.
If you have 6-15 (240V 15A) outlets installed specially in your home, in the long term it would be better to just fit 6-15 plugs to the European appliances.
