My first thought too, so many domain sales go unreported in all extensions, and probably the number and dollar amount dwarfs what does get reported.
Personally I don't expect to get rich in .ca, what it has done for me is be a good side business to bring in extra income. My main work is in the natural resources industry which is notoriously up and down, and goes through recessions like in 2008-2010 period. I've had times when domain sales and even some social media username sales have really helped out with the family finances. Having a hand in the 'old' economy and in the tech economy has actually been pretty good, they complement each other as they have never usually both been down at the same time in the past 20 years.
That said, I do think it's possible to get rich in .ca, if by that you mean score a big sale or bundle of sales to really move the needle in your life (eg: pay off a mortgage or big debt, money towards buying a house or car, taking a dream vacation, more peace of mind for retirement, etc). All depends on what everyone considers rich, but a big domain sale is always possible if you have the right domain and the right buyer comes along.