The results so far (only showing answers with > 1 responder):

11 "0.0"
8 "-1.0"
7 "2147483647.0"
5 "3.0"
4 "42.0"
4 "1e+19"
3 "9.0"
3 "8.0"
3 "1.0"
2 "666.0"
2 "32767.0"
2 "24.0"
2 "2.0"
2 "1e+17"

To regenerate this, run grep -v "#" poll.csv | awk -F , '{ print $3 }' | sort | uniq -c | sort -nr.

I'm not surprised by the number of votes for 2^31-1. It was the first number to pop into my head when I saw the poll.