[Yxven]

960gs is just a grid system.

Bootstrap has a similar grid, but it also has nice styles for everything else.

Bootstrap is not targeted at someone with design skills or someone with access to someone with design skills. It's for programmers like me who don't have artistic ability who are trying to launch minimum viable products that still need to look professional.

I had originally started by trying to customize templates from themeforest, so my sites would look professional except for the parts I had to customize. This isn't good enough.

Bootstrap enables me to build professional looking websites from the ground up (Admittedly, my sites probably look very similar to many other bootstrap sites, but hopefully, they'll work on theming next).