I've donated useless $20 for nothing(except goodwill funding of the project), so additional $50 for the device would be something I'd choose any day without hesitation.
But nobody is suggesting that. It'd be an additional $605. You didn't feel that the 625/830 price of the phone was worth it to you. The people who did already chose to donate for the "goodwill funding of the project" -- with $625+.