Yeah this must be half the reason. You don't want to buy an orange car because you'll possibly sell it one day and that likely restricts your market.
I think the other reason is probably that car manufacturers charge crazy amounts for non-default colours, so presumably everyone is buying the stock colours and those have to be fairly generic.
I just want to say that you are likely giving the average American consumer a ton of more financial foresight and rational thinking than they likely possess. People buying trucks to use as commuter vehicles at exorbitant interest rates, brand new off the dealer’s lot and falling for the various add-ons and upsells are likely not prioritizing their ten-year profit and loss sheets.
"People buying new trucks" already restricts you to 5% of the vehicle transactions in a given year, with ~25% of purchases being new and ~20% of those being trucks. Factor in the rest of the criteria and I don't think you're really capturing the average transaction at all.
I think the other reason is probably that car manufacturers charge crazy amounts for non-default colours, so presumably everyone is buying the stock colours and those have to be fairly generic.