http://www.appannie.com/copterkid/ranking/history/#start_dat...
they are nowhere to be found in the overall rankings, and even their rankings in the games category tops out at 700ish. Plus, they only sell the game for 99c. I've had apps that sell for 2.99 that are in the top 200 overall paid list on iphone, and I've never come close to 30K/month for a single app.
My most recent sales data (for an app that has gone as high as #97 on the iPhone top paid list) indicates that the #200 top paid app on iphone gets about 300 sales per day. If you factor in Apple's 30% thats about $210/day. So even if their app was in the top 200 (which they were never even close to), it would only generate $6300/mo in revenue at 99c.
It just doesn't add up. Unless the 30K/month is talking about a completely different app?