Farming Contest Idea

I was in the process last night of coming up with new Just Listed marketing ideas when I had an idea along a different line. I wanted to come up with something that was different from what most agents are currently doing and I wanted a way to utilize farming postcards more effectively. So, here's my idea:

Select a farming area
Send ALL Just Listed/Just Sold/Farming postcards to this area ONLY
Start a contest that goes like this - the first person to collect and keep 10 of the agent's postcards and calls the agent will receive a $50 or $100 restaurant gift certificate.

Here's what this would accomplish:

1. Several, if not many, people will start collecting the postcards and holding onto them, giving them more of a shelf life and more effective marketing
2. Residents will be excited to collect another postcard and will watch for them in anticipation
3. Many people will collect 10. They will ALL call into the office to speak to the agent. A relationship is born and the agent will stick out in their minds when they think of listing their homes.

Here's something I don't understand and maybe someone can enlighten me. Wouldn't it be more effective to send Just Sold postcards to the same farming area every time instead of just doing the homes around the house an agent just sold? I mean, the neighborhood around the home MAY have someone looking to sell and they may not. This postcard could be the only postcard the homeowner ever receives from the agent and so the agent is pushed out of their minds just like the other agents who only send them one card. If the agent send the postcards to a selected farm area each and every time they will see how much work the agent is doing, how much they are selling, and agent recognition is much more promising.

I'd love to hear your thoughts.