i agree, understanding the market is pretty important in deciding which apps to pursue. i am surprised on some of the dumb sh!t people buy.

i think one big issue for folks like us actually trying to make a living off the app store is how sustainable the income is. we've both made our respectable apps that have held their rankings for 6+ months. we've also both made gumball apps that get downloaded/bought a bunch initially and then just disappear.