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Pre-1990s Macs (Mac Plus, SE, etc.) in good condition are actually worth a decent amount nowadays as collectors items. Not $5000, but quite a bit more than $25.
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this is the most accurate summary.
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I actually found a 1999 iMac set out for a special rubbish pick up day. The owner of the house was there so I chatted a bit, asked her if she minded if I took it.

It had last been booted on it, complete with working hard drive an; MacOS X 10.3. So $1.299 -> $0.

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That's just typical for computer hardware though. Depreciation is 3-5 years normally, after which it's considered worthless.
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