We don't get charged for proof of insurance slips for our customers, that isn't right.
What you have to watch out for is the low-lifes that ask for it and then go on site and do the job with their shop help, once the property manager has it in the office, they don't ask for it on site, so after you fax and email it all, a guy from the sign shop shows up and does the install. You cannot work in most reputable places without WSIB and Liability around here, problem is they never ask for your ID when you get to site.
I've been insured for 12 years, this guy and his brother have never paid a penny to an insurance company for liability or workers comp. and has been in business longer than me. Thats a kick in the face.