I am not a buyer but here goes my guesses on the mater:
I'd think when one buys an EL they'd be looking for the image in the highest res possible
having said that it doesn't necessarily mean they'd always need a huge file for their products so my assumption is that the size you mention might still be useful for a usage that normally requires EL.and as we know EL is not size a based licence but number of final product and some other parameters involve as well.