I was furious when my dad sold our ZX Spectrum 48k, somewhere around '85 or '86. I just couldn't believe it.
He said that he sold it because a "new" computer would be purchased sometime soon, so he only did it as an ugrade, so to say. Anyway, 6 months later we received a C64. :-)
It was a very fun machine for us, however I could never forgive my father for selling the speccy! :-)