Interestingly, quite a number of countries have compulsary voting. According to this list, at least 15 countries have a fine for not voting, and in 3, you can actualy be imprisioned for it. This seems tantamount to handing out goodies in the voting booths.
As to your first point, there's little way to tell the difference between somebody voting randomly and somebody voting intelegently. I'm told that there are some statistical analisies performed to catch potential votebots, however I can't discuss the details (because I don't know them).
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