To me personally? It isn't worth anything.
For me, to have a custom that is worth any amount of money, there are three factors:
1) Quality of workmanship both in the figure and packaging - sure this guy re-packed the figure, but all he did was give it a coat of chrome spray paint.
2) Source the Custom Figure is from - if its concept art, obscure character from one of the movies or cartoons or if it's a popular EU character contributes to a custom being considered worthwhile - last time I checked, there weren't any all-chrome Clones running around in ROTS
3) Probability of Hasbro eventually making the figure - if the character is one that may one day get made, then that takes the figure down a few pegs, however, if it seems so obscure that the chances of it getting made are slim and none, then that helps raise it's value in my eyes - for this item the chances of Hasbro making a Chrome/Silver ROTS Clone are in my humblest of opinions, VERY HIGH. They stated "no more silver/chrome figures" and yet we're getting the third Silver Vader released courtesy of a really lame KB Toys exclusive.
Anyway, to someone else, this might be a real treasure, your mileage may vary. I just thought I would chime in with my $0.02.