Though the
other thing with "collectable" computers is generally the
collectors' value is still less than things originally cost, at least
for now. Note I did say generally, there are many exceptions, but
more often than not, things are just reaching the original cost.
The obvious exceptions are some (origianlly) cheap UK home computers,
MK14, ZX80 and Jupiter Ace. All sell for a lot more now than they did
origianlly.
The ZX80 was (iirc) ?99.99. At one point (1999/2000) the UK ebay price
was ~?400. A quick completed listings search just now suggests that
~?110-?250 is nearer the mark. No MK14s or Aces in ebay's current
completed listings so no idea about those. I don't think you'll
get rich selling old home micros.
Antonio
(260675156877 is another ZX80 but this one will set you back a lot more.
Mind you, it's worth it as it'll win pretty much any "my $system would
crush your ZX80" contest you might find yourself dragged into. You
could live in it too, so it qualifies as a mainframe.)