While these are not a pay site per se, Rapishare, Megaupload, and others seem to be a critical part of how we access the files not only on this site but others,
I have been somewhat reluctant, correction, I have refused to provide any credit card information over the internet since I had some issues with credit card fraud. These sites do provide a secondary level of security, through the ability to pay with PayPal.
I have used a number of these sites and their free download capabilities. Using basically that method, all seemed to be basically the same as far as speed, waiting for downloads, or download limits. So, because of the appearance that Rapidshare is the largest or at least seems to be from my observations and its rates are basically the same as others I am joining as a premium member, that was after I discovered that while the price is in euros, they would gladly accept my PayPal $'s.