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The people who know what they are doing, will do a NPV calc, realise that the bonds are actually probably worth **less than** 30K to them, but buy them anyway because they don't mind losing a little interest each month for the chance of a bigger prize.
This is just like people buy lottery tickets, knowing that they're really only worth around half of the quid paid for them (only around half goes to the prize fund, the other half going to tax / "good causes" / etc). But they don't mind that the average value is much less than they pay, because they have a (tiny) chance of a big prize.
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Can you *reliably* quantify the chances of guns remaining banned, or becoming legal?
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Can you *reliably* quantify the risk of the congestion zone being extended to encompass that particular dry-cleaning business?
If you know **for sure** what is going to happen, then a future-looking valuation may be better than a past/present valuation. But any uncertainty will produce an inherently *un-*reliable valuation. Don't you agree?