Second hand markets help to keep the primary market propped up higher than it otherwise would be. If you can buy something and it retains resale value, then the initial purchase price is more worth it. Whether that balances out with supply/demand and price/sales numbers if there were no resalability is another question.

To be fair, the antarctic continent wasn’t always at earth’s southern pole, it was at a lower lattitude, so implying the overall earth temperature is why it wasn’t covered in ice is less significant.