I think Mikoto Misaka phrased it best in season 2 of 'A Certain Scientific Railgun,' when she was on her epic quest for the Gekota pin, the anguish of a collector who goes to extreme lengths to get character merchandise, only to ask themselves after they get it; 'Now what am I going to do with this?'
Sword Art Online keychains are a bit like that.
These versions were very reasonably priced on the secondary market, are high quality, and have adorable chibi likenesses of some of my favorite characters (Asuna, Kirito, Silica) from on of the very best animes out there. Still, what exactly am I going to do with these?
Check out the slideshow for some comparison shots for scale, as when purchased online, it is very difficult to tell that the ones purchased here were not the same size. It was a bit shocking to discover that Silica is roughly double the size of Kirito and Asuna.