Maybe one thing to consider is this. There is one more point the committee may wish to consider, which is how difficult it can be for some people to come to Canada to marry their spouse in Canada. It can often be difficult to get visitor visas. What you are describing becomes an alternative to that, so it may be worth thinking that if proxy marriage is a problem, it might be important to look at Canadian visa policies with respect to the admission of people who are intending to come to Canada to get married.
On April 9th, 2014. See this statement in context.