I've been a huge fan of vintage clothing and accessories for so long, that buying things used feels pretty natural. My favorite thing ever is to visit cute little vintage boutiques just to see what I can find. It's sort of like a treasure hunt.
Plus, when you buy something that has been pre-loved, it comes with stories, and a history, especially vintage. There is a sort of romantic nostalgia with the whole thing.
That being said, this is usually for vintage, no longer made items. I own a lot of used current-era bags too, and have no problem with them. I've been very fortunate, even off ebay (keeping fingers crossed), and will definitely keep going with used, so I can have more pretty things than I could otherwise justify.