Why aren't you republicans getting it. CANADA DOESN'T PAY FOR THE ROYAL FAMILY. We cover the costs of visits to Canada, and that's it. 

As to our cost, there's the Governor - General and Lieutenant - Governors. Now, replace these with elected positions. You pay the same salaries and ancillary costs, and add the costs of any elected office, from elections and canpaigning on down. 

A republic, by contrast with our current constitutional monarchy would be more expensive. 

And imagine scenarios like in BC if the decision was in the hands of an elected person, with political ties (and don't try to say the office could still be apolitical - that's a pipe dream). As the article mentions, the result would be litigation, and (more) political turmoil. 

There really is no strong argument  against our current system. The argument for change is an argument for republicanism, but without any benefit to Canada.  As this article points out, the monarchy  really is the best option available.