[gurvinder]

Its usually done to trick the top grossing apps rankings. Developer will raise the price to $1k then buy himself some copies using different fake accounts, thus raising the ranking. Once ranking is achieved, they will reduce the price in hope to get more sales.

[nchuhoai]

I'm no expert in App Store rankings but isn't that quite expensive way of doing so? Assuming you pay it 10 times, you end up with burning 3000 dollars in Apple transaction cuts.

And I doubt 10 sales, will get you into top-grossing

[fmavituna]

What's the cut of Apple in that kind of purchase and how many do they need to buy to get in to that ranking?

If it's 30% and 20, it's still quite a bit money.