Some cars / trucks are not that bad.
Paid $48K for a 2017 Jeep Summit.
Ran it for 36 months and 40K miles.
I got $33K in trade. That’s $15K for 36 mo
Amortize $15K over 36 months comes to $414/mo
Amortize the whole Vehicle over 10 years (for the life of the vehicle more or less). And that comes to $400/mo
So I’ve essentially lost nothing. Only paid for what I "used" really. Owning a $48K SUV isn’t free.
Now let's do similar math to OP's case.
I'm guessing his $144K is with taxes, destination etc. and no tax incentives.
So let's round that to just an MSRP of $130K (Model S/X dropped about $20K)
Amortize $130K over 10 year comes to $1083/mo (this is our reference monthly cost to own for life of vehicle).
Now OP says $70K on Trade in. Well, with Tesla Trades don't include software so a "normal" trade, say a trade on a TayCan might be more like $80K (way overly optimistic I know, but the math is easier, but it would probably be more than Tesla (as sad as that might be) if you can show the value of software )
$130K - $80K = $50K.
Now Amortize $50K over 12 months use comes to $4160 / mo. Yikes.
I guess that's why folks say it's a good idea to lease.
The trick is to drive the cars a lot longer. I paid 36k for a 2010 STI, and when I sold it 8 years later to get my Model S75, I got 22k for it so around 2k a year. I am pretty sure it'll take a bit hit after the first 4 years, but I think from years 5-8, it really won't make a big difference. I'll probably lose 35k on the S, but that's just 4k a year on a car that saves that much on gas.