It helps prevent the scan/selection of all rows from the table, i.e., a way to optimize an ORDER BY RAND() query without scanning/grabbing all the rows. It is hard to say how many is too many, but after a few hundred uploaded files, you should probably undo the edit, and yes, the pro version does the same sort of thing.
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While the work or play is on, it is a lot of fun if while you are doing one you don't constantly feel that you ought to be doing the other. -- Franklin Pierce Adams
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