There can be a whack of tax on selling a secondary property, even more so when it is a rental property that has been depreciated, and that has been the case for decades.
I'm not sure if all the various restrictions on foreign ownership and vacant properties has really helped lower prices in those parts of the country that have them, they generally remain far more expensive than here.
I feel some well of people just regard them as a nuisance, they can also be hard to police and enforce compliance. We also have had higher taxes for property flippers in Canada several years now.