Dude...rogues/stalkers>GS...dun try to diss my class I use to get a majority of my zenies and gears D:
I picked rogue over sin due to cheapness factor overall for me, along with how much utility they seem to have in pvm compared to a sin. Anwyay that's about all there is to it.
Gunslinger is just decent on high rates due to access to mvp cards and usually custom gears. Also they may change how some skills work for slingers and other classes. With easier access to the top gears of the game you can probably kill other classes pretty well. Its especially a lot easier if you get more job points than usual. Slingers hurt a lot since it feels like a class that needs to be able to switch guns around a lot to get the most capability but they barely get enough points to do this if at all. High rates with like 90 job points or whatever change this and slingers actually gain a nice well rounded build that actually seems extremely appealing.