I can tell you why, because people like to touch/feel/see the socks before they buy them. Some people like to gauge just how big 'for foot size 6-14' really means for that particular manuf. Others just like to see if these socks are somehow different than every other socks they've ever worn... maybe these use some fancy new materials that make them indestructible.
Now, note, those people aren't afraid to rip a 'sealed' bag to learn this. Now, suddenly, for some reason this sock is not perfect--but wait, maybe it is... Even THEN they will put that bag back that THEY opened and buy a bag that hasn't been opened. And then nobody will buy that open bag, unless maybe, it's the last one--and even then probably not.
So, resealable allows people to screw with the socks bags and the employees can put them back in there and you can live blissfully thinking that you bought them brand new and they don't need a washing before you wear them.
<- Always washes his clothes before wearing them.
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