How much someone is willing to pay you won’t find out if you undervalue your property (out of ignorance). Only a bidding process can prove that to you. Your line of thinking prevents you from achieving a good price.
You completely underestimate the financial situation of many fellow citizens. They have more money than ever and most still don’t know what to do with it. Especially considering the inflation applied.
Maybe Kati still remembers how huge the rush for new building plots was there. You can take that as an impulse to see how large the “army of solvent buyers” actually is. But they don’t stand by the roadside and are transparently countable; you have to attract them, then they will come ;-)
I also have neighbors where you thought, hmm, how do they actually do it? The trick is: inheritance and/or dowry. And not a small amount.
You can currently get €500K for €1,666 over 10 years, as an example with 3% repayment. Plus six-figure sums from mom, dad, grandma, and the money is there. That’s how it works, even today and not just in 2019.
I know, you believe in eternal growth, there have never been cycles, no crises either, and whether a house becomes €70,000 or €100,000 more expensive per year doesn’t matter either. ;)
A “bidding process” gives you a price, but whether it is the highest possible, you don’t know.
The problem is the bubble bias – many people here have extremely extraordinary salaries (and thus the play money for stocks or coins). For ‘normal’ people it looks different. And it’s about that mass alone. And a 140m² house nowhere near anywhere, 40 km out in the sticks, is simply not the primary destination for high earners. And that will be necessary if the price, as you claim, should at least cover new construction. The new project is shooting up close to €600,000. The previous project was at €450,000. You already have to convince the bank that there is a new value in that size order. Or else bring equity alone for the hot air -> €100,000 + normal equity.
To get the loan, you need a lot of equity and income. And whether 10 years fixed interest are currently that smart?