I think part of it is that you made the sincere offer of refund, and gave people control over that. Regardless of how reasonable it is for a sincere creator to

I think part of it is that you made the sincere offer of refund, and gave people control over that. Regardless of how reasonable it is for a sincere creator to keep the money on a failed project, people still appreciate being able to have the option to 'pull out' on failure.