FileSonic.com - Was known previously as SharingMatrix, They come up with a new site, new interface and new plans for earnings as well! They pay upto 35$ per 1,000 downloads if you're on Pay-Per-Download plan, OR 65% of each premium sale! I've never seen a site offers such rates to be honest.They also have plans that pay pay for both downloads and premium sales but at a little low rate.
You can upload through the site directly, through FTP or Remote Upload. You can also host your images to FileSonic.
They pay every Friday via PayPal, WebMoney and AlertPay, minimum amount is just 15$
To read more about their affiliate program: http://www.filesonic.com/affiliate-program
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