Assuming you'll be in the same house for 30 years is a big gamble. What if you need to move in 5 or 10 years? You're house value doesn't go up $40k when you put $40k tesla roof on top.

I would bet a tesla roof actually reduces your house value. Imagine the cost of any roof maintenance, or trying to find a roofer who can work on it without just doing more damage.