Hi, the deal is only open to people who have liked it. Once the like limit is reached, people cannot like it anymore. This lets retailers control how the deal pans out.
I suppose traffic in itself is valuable, since CPC/PPC marketing in itself is a lucrative industry. We plan to charge a monthly fee as a start.
What if the deal is only good for 50 people (that the vendor can handle) and you've got one where 1000 people hit the like button?