I have a Volvo C70 as a daily driver so this would be more of a second car. I alternated between my 300e and Volvo when I had the 300e, so didn't put many miles on either one.
But I would drive it as much as possible. I would not be buying it as an investment even though Pierre Hedarry feels they will be going up in price like the 500E did. It would be a forever car though.
What do you think of your 2 400Es'