It is indeed curious. But
It is indeed curious. But it's also unimportant in another way entirely: home charger prices have dropped rather sharply. When the home chargers were $3000, $1000 in tax credits helped a lot. Now that they're down near $1000, $1000 in tax credit is ... perhaps "inappropriate" is a good word?
(see amazon.com Leviton-EVB22-3PM-Evr-Green-Charging-Station/dp/B004G6ZSZG for example)