Board Thread:Game Discussion/@comment-175.143.90.202-20130822054714/@comment-10101308-20130827153326

I don't think it's rigged, but I do think there's an unequal weighting between Bot and Alt modes. I'm guessing about 70/30 rather than 50/50, so you're more likely to get duplicates in order to entice you onto the main Space Bridge.