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I've gotten the platinum trophy for two games: Persona 4 Golden and Gravity Rush, both on Vita. Doing these trophies on Vita was an awesome way to keep playing these two games as I could just do it on the way to work. Once I had finished both of these games, I didn't want to stop playing yet, so I decided I may as well get the Platinum Trophy and use it as my excuse to keep playing! Since then, I keep a general rule that if I love a game so much that I know I'm going to go back to it multiple times or keep playing, I go for the Platinum. It's challenging and let's me see a good majority of what my favourite games have to offer. :)