My mortgage payment plus property taxes is less than the going rental rate for an equivalent 3br suite, and I bought last year.

The thing that convinced me is that my mortgage payment stays the same every year while everything else goes up with inflation, including my salary.

We'll see where we're at when it's time to renew in 4 years but the way things are going even if it costs me an extra $1000/month I'm still probably coming out ahead.