One of the main reasons for the choppers is to better continue suspect apprehension pursuits. What you don't see is that when the dinks get caught, after they have driven on sidewalks and into oncoming traffic to cause an accident which the pursuing officers will either get involved in or stop to help, they go to jail for a single night. If they don't have a huge record or multiple ongoing charges, they get cut loose on a recognizance from a judge who says "promise me you wont steal cars anymore, son". And the bag nods his head solemnly, signs the recog and is out the next morning. When it gets to court, he can plead guilty and get a whopping ONE YEAR PROBATION!! OMG!! Most judges have a "kids will be kids" attitude towards car theft, which they actually still call "joy riding" in some cases. And if you look at some of the recent incidents in the GTA where officers involved in a pursuit were charged with Criminal Negligence because the bad guy caused an accident, it just isn't worth it. If there is a chopper shining a light on one of these tools as they careen along then they will just keep going until they brew someone up. If there was any real penalty for it, I would be the first one to keep after them and pin them down. As it is, at least in southern Ontario, it basically is not against the law to steal cars. Just make sure you steal a crappy one that is worth less than $5000, and it's the same charge as shoplifting.
So the Chief of Toronto (and I am not defending him at all BTW) is probably thinking that it isn't worth the time and expense, until sentencing of car thieves is made more harsh.
I imagine that these smaller mentioned services have some sort of safety/rescue angle to justify the expense of aircraft. Toronto is too urban to try that tact and besides, everyone knows that only firefighters save lives. ;D