This is a rather vague response, but I'd say that one of the characteristics of offshore financial centres is that there is generally a lack of transparency with respect to their administrative, legal or legislative provisions. That characteristic has no equivalent in Canada. In tax haven countries, there is no Security and Exchange Commission, nor is there any financial market authority. Therefore, it is easier to develop financing packages that would be impossible under Canadian or U.S. laws.
On March 10th, 2011. See this statement in context.