In 2013, the Law Society of Upper Canada spent over $340,000 on costs associated with call to the bar ceremonies. As the number of candidates eligible for call to the bar increases every year, the law society has had to increase the number of call to the bar ceremonies at an additional cost. A fourth ceremony planned in Toronto for June 2015 comes at an estimated cost of at least $42,000. Here's the prediction on the number of candidates who will be eligible for call to the bar in the coming years.
Source:
http://www.lsuc.on.ca/uploadedFiles/For_the_Public/About_the_Law_Society/Convocation_Decisions/2014/convnov2014_pdc.pdf