I would like to submit a simple letter to my clients for your critique. I have been offering a variety of services and have had fair success. I simply would like to expand a bit. I'm not sure of the best way to word the reward clause. It is, at this point, very simple. Mowing clients, in this area, are put off by and resistant to contracts: Thanks Landscaping- referral reward of 10% of labor to referring client for referral valued over $150.00 labor. Mowing- 1 free mow for referring client after 4th mow for referred client.