I'd feel the same, especially if I happened to acquire a NiB SSK.
But then I'd rationalise that if I did not use the keyboard and kept it in its box, pristine and unused, then whoever gets the keyboard after me, however long it takes, will either discard or destroy the keyboard, or will use it themself.
So I reckon I might as well just use it myself.
This is yet to actually happen - NiB SSKs tend to exceed my budget.