Confused packaging

I bought some socks, a package of six. The bag advertised that it was resealable. It was basically a big ziplock type bag. But why? Aren't I gonna take the socks out of the bag, put them in my sock drawer, and then throw away the bag? Why would I need to reseal my socks? Do they keep fresher?

I bought a big bag of pizza rolls. Serving size 6 and 90 in the bag so I'll be opening and closing it a lot. Is it resealable? Of course not. :/

Serving size 6 rolls... and the cooking instructions call for 15 rolls. So someone only gets half a serving?