I feel like the majority of NFT scams arise when some random unknown person makes something and then tries to pass it off as valuable. There's initial demand, and then once they realize it's just some random thing that nobody cares about, the demand crumbles, followed by the price.

If someone desirable like Trump makes an NFT, the demand for the NFT is likely going to stay stable and increase once the NFT stops being available and there's no more being minted. Therefore the price is likely to increase.