KANSAS CITY, Mo. — On the plus side, fans may never again see tickets this cheap for a Chiefs playoff game. On the negative side, the wind chill may never again be this bad at a Chiefs playoff game Temperatures aren’t expected to get above 6 degrees Saturday, the National Weather Service said, and the wind chill could be as brutal as minus 31. That forecast has pushed down prices on the secondary market beyond what was expected. The website Finance Buzz researched ticket sales from last year’s postseason and found that ticket prices on the day of a wild-card game on average were 21% cheaper th…