I think keeping away from malwares is one of the very important aspect one should consider. This not only saves your RAM, it saves your battery life and in some cases, I would say even money! because when it comes to malware, they can make your phone do really bad stuff.

To know about Malwares of android, I would suggest readers to go through http://techwikasta.com/2012/12/android-malware-pr... .