It's not what you have, it's what you do with what you have that matters. Going with a car example, spending significant income for a nice car that you use for normal transportation like commuting and shopping will bring little joy. On the other hand if you are into motor sports, regularly tour on or off-road, like to restore classic cars, etc, you will get a lot out of a big car purchase.
Spend it on one thing, don't have it for another. It's really hard for me to calculate if something new is worth X amount of my money. So I transform that money into something I already know how much it costs and how much I enjoy it. Would I rather change my car for a new one or take 10 one week trips abroad? I'll take the later so I decide against the new car even though that will not be exactly what I spend the money for.