[LSB]

customers will reccomend you for nothing if you ask or prompt them .
a genuine thank - you is enough .

[Taylor & Taylor WC Services]

customers will reccomend you for nothing if you ask or prompt them .
a genuine thank - you is enough .

Very true

[Jimmy Jon]

Thanks for the feedback, I'm not going to bother with any incentives - I believe that if you do a good job, are friendly, polite, courteous and well presented then your existing customers will probably recommend you to their family and friends anyway.  

[Count Phil]

If it works then its worth it. Think of it as a purchase cost of new business - like buying a round. the only way to find out is to try it.