The worthiness of your stuff isn't defined by you, but by the one who buys it.
You might think that your code is about 10k worth, but those are wished 10k, the actual price is defined by the other party. While you are still be able to say no to an offer, it doesn't increase the worth of your stuff.

This said, I wouldn't sell my code for $50 either, but only because I have someone else who pays more (which is still way under 10k)