NH: The Clunker State

This post by Calculated Risk on the CARS 'cash-for-clunkers' program has a neat sortable table that shows the amount of rebate money given to residents of each state.  

If you sort the table by 'dollars per person', you can see that New Hampshire had the highest per capita rebate rate and Vermont had the second highest.

I was thinking it's just because we're frugal yankees and can't turn down free money, but several commenters on the CR post pointed out that the top 5 states are either heavy snow states where lots of road salt is used or an Island where salt air is present.  Coincidence or causal?