I was reluctant too at first but set it up so she can not type own things, she is unaware that there is free type. I limit how long she can go on for. (plus it's an extra tool on my belt for good behaviour)
Yes I luv to admire the puffles and and igloos too, especially the dance floor that she has just purchased
She even dragged me kicking and screaming into Disney store to purchase the puffles, jitsu cards, the official book etc (my dvc card comes in handy )
My DS loves it, and we use monthly membership as a reward for good behaviour. My class at school had a class penguin too, and it worked really well for co-operating over what to spend their coins on, making sure puffles were fed etc!
DD10 does too, but it is in fits and starts, one minute that's all she does, the next she's not that interested. We gave in to an annual membership in the end, got fed up of renewing every month!