Unless you don't have a lot of ram and don't want to spill over into swap?
Aside from that, why would you say that? So if it idled at 8 GB of ram (which it is on its way to eventually doing) would you still say that?
Do you have any idea how ridiculous of a concept it is that a clean operating system alone idles alone on 4gb of ram? What in the hell are the services doing that would make it idle that high? The bloat stacks too you know, if the code that is used to run services in an operating system is inefficient, it will get proportionally worse the more services and programs you open up.