Power Switch Question

I am upgrading some of the key parts in my Cyber 211 and now that I have this thing opened up, the power switch looks a bit odd.

Both the positive and neutral legs from the IEC plug go to the switch is 18g wire, and then come out as 12 or 10g to the torroid.

Anyone know why both the pos and neutral go to the switch? Shouldn't this simply toggle the positive side?
I am also looking to upgrade this cheap nickel plated switch with slip connectors to something more audiophile-ish, but can't find anything out there. Any suggestions?

I have lots of pictures of the internals if anyone is interested.

Thanks to all.