BUT, ranking WS's with proper gears and buffs get a pretty decent % chance to make items. On top of that if they are job 70, they make the weapons refine easily. I have a ranked +7 VVS Ele Set, and it does wonders.
But now you're saying "oh but if you overup you'll do more damage." Well duh, but if you can't afford to overup, then VVS wins, and its worth paying an extra couple hundred thousand for. :>
By the way, easy way to get star crumbs is to hit up Miyabi Dolls.