For what it's worth, that Corgi car is still a crap investment. Using round numbers, if your investment increases in value from $10 to $400 over 50 years, that's about 7.8% return per year. That's lousy. It's especially lousy considering the risk of investing in something as insecure, difficult to liquidate, and volatile as a toy. Hell, your kid can break the damn thing when you're not looking, sending the value directly to zero. And, that's one of the "success stories". For every crap 7.8% return on a Corgi, there's an abysmal negative return in a hundred other toys that are completely worthless.
You're better off in almost anything else. Stocks, bonds, real estate, jewelry, metals. Anything. Better return. Lower risk. Less volatility. Easier liquidation. If you own a toy and happen to get lucky on the value, that's fine. But, it's luck, not investment ... and, it probably isn't even as "lucky" as you think (like the Corgi example). If you're planning on retiring on toys or other collectibles, you're going to be broke.
SnakeDoc