I enjoy putting a natural patina on certain items too and I think that is the best route to go for achieving the 'authentic' look. The only caveat to that is that for many people their jobs, other obligations, etc, prevent them from using their equipment on a regular basis. It is true that people in the past would have acquired 'new' goods, but they would have been put to hard use right away. Maybe you would have seen someone with some bright, shiny, new gear, but that probably wouldn't have been the norm, and definitely not for every single thing they were carrying and wearing. So while there is nothing inauthentic about having fresh looking gear, if you can only use your gear 1/10,000 of the time someone in the past would have it may be decades before it acquires that broken in look. For that reason I do see the merit in faking it so you don't look like you walked into 'ye olde trading post' buck naked and came out with brand new stuff every time you are reenacting.