Well, 20 bucks instead of 13 isn't triple, but rather about 50% more expensive.
Personally, I've never added fans to my case beyond the default ones, and I've never needed more. Although I've only ever had one rig, and that for less than a year, so maybe I'm not the most experienced person in these matters.
Personally, I've never added fans to my case beyond the default ones, and I've never needed more. Although I've only ever had one rig, and that for less than a year, so maybe I'm not the most experienced person in these matters.