Being from a direct sales background myself I think you will get a lot more inquiries if you openly answer a question, as in what is the product/service and how does your client wish to be marketed, via tel, door to door, shopping centres, store promotions etc?
Each type of market demands a different skill set, a good door to door salesman very often cannot gain leads in store for instance. £10 per deal might be a fair reward, but if it is only a 1% conversion rate expected and it takes 10 mins per explanation, then others might think it is low.
Even in the early days of gas deregulation I was paying £20 per deal to my reps, some were selling 25+ per day, my requirement regarding the amount would be down to the length of time per lead and the size of the market.
Care to post some reasonable information?