[jadedoto]

Marketplace does have a "Top Paid" and "Top Free" section for each genre similar to the App Store.

Most of the apps in App Store are crapware too

Apple gets a revenue from iAds as well. Notice that most of the Apps in App Store that are free are ad supported?

(I don't say this as a troll baiter, I own an iPad and an Android phone and love both equally)