I have collected many of the modern 6464s also because I liked them and never had any as a kid. I do run them but they are mostly for display. Many I have ignored because I don't care for their decoration like the overstamped cars. As for the idea of collecting for profit, I have never considered that aspect. If fact I learned decades ago that its a fruitless pursuit as I watched my HO brass steadily decline in value, not unlike beanie babies. But then I didn't collect them for an investment either so nothing has been lost.
Pete