A $300 meal isn't 10x better - in terms of taste (subjective obviously) or nutrition - as a $30 meal. A BMW 3 Series is a better car than a Ford Focus, but looking only at the practical reasons to own a car, it's not even close to having twice the value.
In a lot of cases, brand names bring no value other than the brand. And while that can have a placebo effect, it's not more value. Medicine comes to mind as a great example. You are paying more for marketing and packaging than you are for R&D. The recent thread on memristors even highlighted that R&D costs are 1/100th of total cost, with marketing taking the lion's share.
Quality items appreciate while cheap items depreciate? No consumer good should be viewed as a financial investment. If something does appreciate in 50 years, it'll be more about luck than anything else.