I don't think Rapidshare offers money for frequent downloaded files. Neither does Mediafire. So that is a difference.

RapidShare - Wikipedia, the free encyclopedia

Before 1 July 2010 there was a rewards program that allowed the user to trade "RapidPoints" for a selection of products depending on the number of points the user had collected. On June 18, 2010, RapidShare announced that it would stop this program along with RapidDonations on July 1, 2010, to avoid the impression it rewarded its users for uploading copyrighted material.^[7]