The difference there is that the demographics actually have an effect on a person's likelyhood of voting a certain way.  The demographics of the people installing the thottbot mod have NO EFFECT on that person's drop rates and are thus act as a truly representative random sample.

Don't belittle someone else's understanding of statistics with an argument with such huge holes in it.

As for your drop rate, I suggest you go google "law of truly large numbers" before you post again.