I don't believe in refunds.

When one funds development of a device there is always the possibility that it goes all tha way south, for some reason the product never materializes.

That is the nature of investments; you put up your share and it might gain you something. Or not.

And if the project fails that's it, don't expect anything back from it.
This is the part that people just don't get; it is an investment, not a purchase.
Just like investing in a startup company; you give 'em money and hope it grows into something. Most don't, and hopefully the 5% that make it will gain something back on your investment.

I have invested in development of devices, sometimes it works, sometimes not.
The money I have put into that is peanuts, I have lost some thousands of euros which is nothing compared to what I have lost in stock market.
If you are not willing to lose your investment, stay out of the game,