Why should we tip for services? Why not raise wages so that people can actually live off an full time job? 

In fact I would argue the first 8 hours a person works should be at a casual rate of say 18/hr the next 11 hours worked at a partime rate of 16/hr and the last 21 hours worked at a full time rate of 14.5/hr.  A premium of 1-2 dollars/hr could be applied for certain expensive regions like GTHA or GVA, etc.

THus the incentive would be on employers to hire full time workers at a wage of 
15.62/hr for 40 hrs; a part time worker would get 16.83/hr for 19 hours worked and the casual worker would get 18 per hour for a single 8 hour shift.

It still means the Full time worker over 40 hours gets 624.8 total, the part time 319.77 and the casual worker 144 total per week!

The incentive is to hire one full time worker instead of 5 casual workers, which would cost 720 per week. ior even 2 part time workers which would cost 639.54 per week+ deductions!