It's true, it'd be super cool to have a Tesla :) I told him if we suddenly come into a million dollars, we could buy one after we paid off our house and put a bunch of money into investments accounts for our future children.
The problem is more that he grew up with big trips and big presents, and I grew up camping and being like "sweet, I got 15 books for Christmas because Mom is great at finding cool stuff at Goodwill!" He's far more frugal than his parents, but far less frugal than I'd like him to be, and it commonly leads to minor conflicts about what it is a good idea to do with our "extra" money.
An example of what he grew up with: his dad passed away about 10 years ago, his mom is almost 60, doesn't have nearly enough saved to retire at a "normal" retirement age, and still owes money on her house. However, she bought us a Nest for Christmas to replace our programmable thermostat (~$250), in addition to Keen sandals for DH ($90) and a new iPod for my sister-in-law (IDK how much those things cost. Too much?).
Like I said though, he's coming along to a slightly more frugal mindset, other than occasional minor breakdowns about how we must be doing it wrong because his co-workers get to go on big trips and have hot tubs in their backyards, and we're still saving up for kids, lol.