Yes, but markets where the items wear out and need replaced.
There are numerous markets where the items either don't wear out or wear out so rarely and so slowly that this is simply isn't an issue. Perhaps we should ban the sale of second hand houses? Poor Bovis, they build a brand new house and when it gets sold on, they never get any extra money from it. And it doesnt wear out for hundreds of years.
It loses appeal - which is the gaming equivilent of wearing out. Who cares about Battlefield 1942 anymore? Who gives a stuff about Quake 2? Not many people. In gaming terms, its worn out. Second hand games are not generally brand new fresh off the shelves hot releases - not in any meaningful quantity.
This currently happens in the console market without a big problem. I appreciate that CD keys are easier to 'sell' but frankly whose fault is that? Who pushed the market towards entirely non-physical media so they could reap massively huge margins at the expense of everyone else in the industry? Forgive me if I don't cry a river for Valve - they didn't cry a river for the high street retailers (Not that the trade in games people have finished with would ever have the same sort of effect on them, anyway)
I don't blame Valve for the way they operate. They operate in entirely the correct way for a business. But a business must also operate in a way that is compatible with government legislation which is usually designed to protect consumers from monopoly power.
As I keep saying - the way around the problem is simply. Build products that people want to keep. Then you need not worry about the trade in second hand games. If your product is so good people feel they get such great value from it they don't want to part with it, you've nothing to worry about.
I appreciate people like EA with the 7 hour long SP junk they trot out on a regular basis might have something to worry about, but hey, something has to force them to up the quality because as things stand they are quite happy making money out of the vast swathes of people seemingly happy to spend vast quantities of cash on sub standard, short, microtransaction infested tedium.
I'm quite careful with which games I buy. I only buy games I think will last me. As a result, if it became possible to sell Steam games tommorrow there are few if any I'd want to sell. Because the ones I've bought are decent and I'd probably play them again...
Second sales will always be able to undercut the original developer as they don't have the same costs in their operation.
Just like second hand examples of ANY product in the world then?