TBH, the whole deal of NFTs is kinda stupid to me. Like, why would I want to buy an image which anyone in the world can freely use? NFTs and crypto just feels extremely stupid (that's just my personal opinion and you can feel differently), but yes, I agree with @visualstudios, the buyer is taking a risk on the NFT and he could sell it for $1000, but most of the time, it's a losing gamble. If he does sell it for a high price, well, good for them! In the end, if one out of 10 people are getting a profit, you shouldn't be worried that your design sold for a lot, but that you didn't have to take the loss of $900 for the other failed NFTs.