I pay £10 a deal. No more. I don't see how anybody can say it is worth it paying x2 to a canvasser who has spent just 2 mins at a door. There are tons of people out there who will do it for £5-£10 a deal. After all that's all the boss of canvassing company pays he's staff.
3 years ago when I was doing it I had 4 canvassers and me. I payed them all £10 a deal which still was 50-100 a night for them, but charged 2 cleans to the cleaners we were canvassing for i was making so much money, some nights we got £600+ of new work earning £1200 and after paying the canvassers I'd be left with £800-900 for 3-4 hours work. It was great at the time for me as was like printing money easiest pound note known to man...but how the hell is that justified just for canvassed work??. I wouldn't hand over £2000 for £1000 of canvassed work no way pedro £500 tops.
Bottom line is how easy is it to put an add in a shop window or gumtree or even local paper stating your terms( canvasser required earn averaging £15 an hour start ASAP no experience neccacary). Will get loads of calls I know I did. Save your money for better things for your business.