Yeah, the most interesting takeaway for me is how far these guys got with a relatively small amount of effort by picking the right apps to work on. For example, there are literally hundreds of unit converters in the App Store right now, and they shipped another one anyway to great success, because the demand for such apps are still so high.
It does illustrate that there is still tons of money to be made in the App Store for building the right apps.
FWIW, I have the myConvert iPhone app and am very pleased with it. I've looked at the free unit conversion that go by, but haven't found one that shows multiple conversions on a single screen like myConvert does.
It does illustrate that there is still tons of money to be made in the App Store for building the right apps.
(Thanks for posting this interview by the way.)