Hmm, why is the 'eh' typically Canadian actually? I use it too and I know there are more people who use this as well in our daily convo's in our own language.
lol This has to be a joke.. I'm not Canadian, yet I am very polite and I tend to say "thank you" and "sorry" a lot.. I've actually had people tell me that its okay not to say "thank you" so much..>.<