HOWEVER, and perhaps call me a giant wuss, but when you're at the mercy of not only an algorithm but also a savvy business, it's a pretty dangerous bet to hedge it all on search traffic.
Coupon codes are one of those things I could easily see appearing at the top of SERPs in no time courtesy of Google.
"Credit card comparisons" and other searches like it are a massively profitable keyword to rank for. But take a peek now and you'll see Google threw their hat into the ring, flipped one switch and magically appear above all organic rankings. They're doing the same thing with travel, weather, you name it. I can't sit here and argue it's unfair, it's their yard, they make the rules.
And truthfully, as a user, I completely applaud Google for providing these services, I love the one stop shop and trustworthy nature of their results.
As a marketer, I'm very, very wary to place any huge bets on any sort of long term business model relying on rankings. Should it be a tactic in your strategy? Absolutely. But diversification here is sure going to save a lot of headaches down the road.
But at the end of the day, as far as RetailMeNot goes, get it while it's good I suppose.