How do I determine my average margins after implementing a Kohls cash back rewards program at my retail stores?

You've answered your own question. Reach out to your prospects with the question, such as "How would you...". Ask what people want then give it to them if you can with integrity and thoughtfulness.

Your best bet to get traction quickly in USA is to advertise on mobile ad networks. You may need to advertise on CPM/CPC basis instead of CPI if you have a paid app so make sure you understand your user lifetime value and watch conversion rates closely so you don't overspend. That said, depending on what your niche/vertical is, there are many other ways to market non-gaming apps.

100M+ in revenues in 5 years or less does not happen very often. As an example of one sector, here is an interesting data visualization (circa 2008) of the 100 largest publically traded software companies at that time that shows their actual revenue ramp-ups from SEC filings (only 4 out of these 100 successful companies managed this feat, which themselves are an extremely small percentage of all of the VC-funded software companies): How Long Does it Take to Build a Technology Empire? http://ipo-dashboards.com/wordpress/2009/08/how-long-does-it-take-to-build-a-technology-empire/ Key findings excerpted from the link above: "Only 28% of the nation’s most successful public software empires were rocketships. I’ve defined a rocket ship as a company that reached $50 million in annual sales in 6 years or less (this is the type of growth that typically appears in VC-funded business plans). A hot shot reaches $50m in 7 to 12 years. A slow burner takes 13 years or more. Interestingly, 50% of these companies took 9 or more years to reach $50m in revenue."

10% of the total monthly sales churning on an absolute basis is near fatal. That means that within 5 months, you have 50% absolute churn per year, which reveals fundamental flaws with the service itself. Anything above small single digit churn is telling you and your team that customers are not seeing enough value in your product. I'd start by doing as many exit interviews as you can with those that have churned out, including, offers to reengage at a lower price-point while you fix the issues that matter to them. Happy to talk through this in more detail in a call.

I've been in the picture messaging space for a while now with my apps Lutebox (voted one of London's top ten most loved apps) and now Click Messenger. I've written a few articles about the space including a recent post about the Future of Mobile Messaging. Snapchat started out as an app called Picaboo, which pretty much did what it does now (prior to the latest update with chat and video calling). They quickly rebranded but saw a little uptake in user numbers and had quite low downloads for several months. Then around Christmas 2011 one of the founders' mom had told her friend about the app, who told her kid and her kid basically then spread the word throughout their high school in L.A. That was what really blew up their download numbers as it spread across teenagers at local high schools. As far as I know they didn't advertise in the early days, relied solely on word of mouth. Also it is assumed that they have a solid user base. Comparatively speaking, their user base may be in the low tens of millions, which may a great base of users, but nowhere even close to being as big as Facebook or Twitter. I'd be happy to speak about this in more detail or about the picture messaging landscape and what I believe to be the future of mobile messaging.