[notahacker]

Instant results for minimal effort

You could cultivate similar levels of foot traffic over a longer term for a lower level of effective spend by setting up your own mailing list, Facebook group, running targeted local ad campaigns etc. to distribute your own coupons. But that involves hours of effort. You could pay a third party to run the campaigns for you (my flatmate makes his living running them) but you're committing even more money up front, and unless the third party is supplying or buying a mailing list for you it's still going to take a while for the results to become obvious.