As kogir mentioned elsewhere in the thread, ImageMagick is not designed to be used as a long running process, it will destroy RAM and likely lead to stability issues.
I think with OSX they used the right tool for the right job, because, as always, there is never a perfect solution to any problem on the trilateral axis (good/fast/cheap).
I know! I was being hyperbolic, but you get the idea :-) Memory leaks are almost the same thing, perhaps worse. You can always change a stick of RAM, but chasing down memory leaks, that's more than a 5 min job!
I think with OSX they used the right tool for the right job, because, as always, there is never a perfect solution to any problem on the trilateral axis (good/fast/cheap).