I haven't been here long, so I don't really know the score. I was all ready to be a contratian on this topic, but after looking at the numbers, I don't think I can.
Here are a couple of interesting links from 2006 U.S. Census Data for the two counties:
Ford
Ford County QuickFacts from the US Census Bureau
Finney
Finney County QuickFacts from the US Census Bureau
This appears to explain why Finney could raise more income with a lower property tax rate:
Ford
Population, 2006 estimate 33,783
Housing units, 2006 12,013
Median value of owner-occupied housing units, 2000 $69,200
Finney
Population, 2006 estimate 39,097
Housing units, 2006 13,945
Median value of owner-occupied housing units, 2000 $83,800
$14k per house + 2k extra houses, little extra infrastructure since populations are similarly sized.
I don't know where to get numbers for cars from, but they might be similar.