SKS values may increase in the future, but I don't expect it will be a drastic increase for the vast majority of the SKS's out there. It always comes down to supply and demand. A few years ago the Russian SKS's were worth about double what they are today. Then last year thousands and thousands of Russian SKS's were imported and the prices dropped.
It's true that many of these rifles are not being made anymore, but that doesn't mean there won't be many, many more imported to Canada in the foreseeable future. As long as supply keeps up I think people are better off shooting and enjoying them. If that means customizing, so be it.
Buy yeah, I also support the idea of buying two. Leave one completely stock and cover the other with accessories or flowers or banana stickers or whatever makes you happy.
K.O.