I know one person, he got married to a Pakistani girl in Pakistan. It was a full wedding and everything. Then she applied for student visa and she got it within 2 months. Her husband was with her while everything was going on. In Canada, they had a huge reception and registered their marriage. They lived together for a year or so. Then the guy applied for Inland Spousal Sponsorship. Now they are happily married with 2 kids mashallah.
I was thinking of doing the same in the very beginning and now I regret, good ethics gets you nowhere.