It's not entirely their fault. There are people after all who write code for money. So it's not too much of a stretch to think they might be willing to write code if you share with them any resulting profits.
How many people would be willing to write a novel based on your ideas for money? How many would be willing to write a novel based on your ideas for a share of profits?
How many people would be willing to write a novel based on your ideas for money? How many would be willing to write a novel based on your ideas for a share of profits?