Danger of downloading apps for points?

Some apps give you points for downloading other market apps.
Is there any danger in downloading these other market apps just to get those points, and then deleting the apps after installing it and running it just once? e.g.
Could the Android system on your phone become fragmented like a Windows system can?
Do these apps grab your contacts info, etc. on initial run?

Sent from my unrooted Droid X using Tapatalk 2

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