In all honesty what sealed my decision to keep the unit is that a few days later Ars Technica came out with their review and everyone kept saying what idiots they were for destroying their private key in the name of integrity. If I'm to be called a shill for keeping it or an idiot for returning it, then "shill" hurts a bit less... and pays better... and supports the network... and gets me a historical Bitcoin artifact that will sit proudly on a prominently-displayed shelf LONG after it's obsolete. How can you turn that down?
Ars Technica's route is not the only option. You could also have donated the mining income to a charity.
That's what Wired did, but I'm sure you probably know that.