I have to wonder if the state side manufactured rigging supplied 10-20yrs ago on most production boats wasn't a higher quality than what is found from most Asian suppliers today. I can't imagine replacing our rigging with something used but there are also many stories cropping up regarding new Chinese stainless pins, plates, shackles, bolts and anchor line/chain that are significantly weaker than their older American counter parts.
Maybe sizing up has merit whether it's from overseas or not but used would only be some sort of emergency backup for me. Cheap paper plates, cheap beer or maybe even cheap used sails, but standing rigging(or ground tackle) failure has such high potential to be chaos to a crew/boat that it's unthinkable.
Here's a link to check out subtle signs of imminent failure.
http://www.dixielandmarine.com/yachts/DLrigprob.html
and a pic of chaos and a boat rather hard aground
Good luck Mike