We're in the GTA so it's $1.2K-$1.5k/month in my area.

Daycare ratio is max 1:3 (up to 18 months) and 1:5 (older).Hours of operation are 7am-6pm which means in my child's classroom of 15 (older kids) to cover those hours there are 4 regular staff and a floater so they can have a min 3 people on 8 hour shifts with lunch and breaks. So the ratio is much lower than you are mentioning. 

The facility pays rent  (incl.outdoor space), benefits to the employees, they are required to maintain toys, play structures, change facilities, sleeping facilities, educational material and provide food with a minimum nutritional value for 3 meals and 2-3 snacks a day.  That all adds up.

So I paid $14,000 for my oldest son. His class of 15 -$210,000/year. With 4 full staff for his room and 1 part-time staff that's $47,000/year/staff but then take out rent/maintenance/food/benefits (they actually make $32K). And in the GTA that's not a lot.

Everything I mentioned is a min. gov't requirement.