In a sense, I think thinking like that opens us up to positive opportunities more, as in my mind, life is just a series of opportunities and chances.
Of course it’s not enough to just dream about a new car all day and expect someone to randomly give you a new car, but if you’re thinking about it a lot, you’ll make choices that bring you closer to one. Maybe you're more careful with money because you’re saving for a new car or you just go to dealership "to look" and learn something that could help you buy. Doesn’t guarantee a new car, but it improves your chances compared to just assuming you’ll never have one and forgetting about it. It’s focus, not magic.