What price would you place on yours and your families' safety? would you not pay the extra for a low crime rate area?
What price would you put on your childerns education? Where I used to live, there was empty apartment as some families were renting them just to get the postcode so that they could send their kids to the local school..
would you not pay extra knowing that your property inside your shelter more secure?
would you not pay extra knowing that your closer/quicker to work so you're not suck in traffer for over 4 hours a day?
Rarely the cost of anything is sum total of cost of material, time and skills that was required to put it together... unless you like working for free? The insurance that the property developers, the salary tax/NI of the workers, the time of the marketing team showing tyre kickers around, is all baked into the first sale price. And some are prepared to pay more for it than others.
Do you own your property/ies, do you have a mortgage? have you any experince in this property/mortgage game? as it seems to me, that you just want modern society to collapse so you can have another chance.