So Apple are having a competition to see if they can sell more of the most popular apps, to make them um… more popular!
This will impact the store in the following ways:
Skew the top 100 lists a bit more, again.
Make it difficult for new apps to get up there for the next month.
Make these Apps even more popular, so they will probably remain as the top apps forever.
It will also probably not increase sales much, since these Apps have already been bought the most.
Apple might be better off promoting new new and unseen apps that have been recently popular (where si Skype for example?)
Congrats to the devs in the list, bad luck for anyone who wants to break into the club!