That evidently works for a great many people. For purchases in general, I guess I've almost always been too frugal to buy the best that I can afford. That includes cars, computers, iPhones, sporting equipment, you name it. With each purchase, I try to look for the sweet spot where I feel that value (to me and to my family) is maximized. We feel that our pre-owned Model S-85 was a superb buy.That's why the way to insure happiness when purchasing a high-tech product is to purchase the best you can afford at the time and then never look at another ad, review, or group discussion until your purchase no longer does what you bought it to do. When that time comes, repeat the process.
That said, I think that today's brand new S-75D and S-100D cars offer tremendous value. (I'm truly impressed by the 335 miles of EPA-rated range on the 100D.)