What if I offered you £5k to do a job worth £25k because that’s what I “think” it is worth.
I say no and I walk away. Just as one is able to do on a property transaction.
The issue with property is that there isn't an objective way to come to a 'true' price, because that doesn't exist. A property really is only worth what someone is prepared to pay for it in the current market. And property markets can undergo seismic changes in short periods of time.
there’s massively undervaluing something just to try and get out of paying a fair price for what it’s worth
If the seller's in a strong position with plenty of other bids, why on earth would they put up with that? However, if the seller doesn't get any other bids, then perhaps they have to accept that this is all the market is prepared to pay. It's all circumstance.
However, the seller's perception of what a property is worth can be very far from reasonable and doesn't automatically demand respect. To give you an example, we bid on a house that was originally on the market for €600,000. They reduced the price by €100,000 and we put in a bid considerably lower than that.
At the time, this house was being discussed on property boards as being the most over priced house in the country. So was our bid 'cheeky' (I'm sure the seller thought that) or realistic? Or does it even matter? They rejected our bid and two years later it's still on the market. But to pay even the reduced asking price for it would have been really bloody stupid, so no regrets at all from us on how we handled it.
That's an extreme example sure, but just to make the point that the asking price itself isn't necessarily even in the right ballpark, so I see no problem at all with offering something considerably lower. The seller always has the option of rejecting it.