This really isn't how this should work. If one uses Netflix or some gaming hardware (for which one payed) one should not feel obligated in any way to give to FreeBSD. The Netflix or Nintendo might want to donate to ensure they have an even better system available in the future, but because of the BSD license, they aren't obligated either.
That aside, as a personal FreeBSD user, I have actually donated to the FreeBSD foundation every year for the last four or five years and plan to do it again this year.