I think he's implying that his boycott imposed a cost on him, and therefore had more meaning, because had they behaved differently, he would have liked to have owned a Nissan.
I understand that, but he regrets that his decision could not be more influential.
Which is severely undermined by the claim that Nissan makes great cars
Especially when considering the person making the claim has an implied incentive to hate the cars. He's making a genuine claim that "I want to hate their cars but I cant"
