It would be pretty easy to do with a unique promo code used for online ordering. Our system will show me how many times it was used, who used it and how much was spent. I would be happy to do a deal like that where the cost was based on a fee per order or a % of the money spent and a premium for first time orders. Whether what I am willing to pay would work for the party doing the mailing is another question alltogether.
I can drive the redemtion rate up pretty high with a killer offer… but then I am giving up so much on the price that I am not thrilled to have the costs be high as well. For a high production quality 4 color 6X9 card, I can put 10,000 pieces out to my delivery area for about $2500 including everything (creative, printing, mailing services, postage). If I put a screaming deal on it, I will get about 500 orders (costing me $5 each!) as a result and perhaps pick up 40-50 first time customers… A more conventional offer will generate 300 orders… so it is costing me about $8.00 per order to generate the business… hardly a great equation if I also have to give the customer several dollars off!
Not a bad thing to do once in a while. I will pay 5K per year to pick up a couple of hundred new customers especially if I get email addresses for them and can reach them for 1/10th of a cent from that point on.
If some one offered me a mailing where I get to approve the creative work and set up the offers, I would pay $3 per order generated plus a bonus of another $3 on any new customer and I would be happy to do it several times per year as long as I also get emails.