I do not donate because as you said, most devs are not developers at all, simply modifiers and tweakers of software created by the companies selling the phones. A true developer (eg someone who can write fresh code such as a camera driver for ICS or similar) would be a much more viable candidate to receive a donation, however this won't happen as seemingly no dev is able to actually code, instead waiting for official software. Until "developing" becomes more than copy-paste with a couple tweaks, I do not believe donations should be requested.
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Google Nexus 5 - Stock... for now
- Android 4.4 KitKat
HTC One S - MaximusHD 10 - Android 4.2.2 Jellybean - Sense 5