The problem with statistics is that they can lie!
Example: Assume that 10% of the population earn Eu 100, 000 pa. and that 90% of the population earn EU 11,111 pa.
Thus the average wage is (0.1 x 100000 + 0.9 x 11,111 =) Eu 20,000
As to owning property. Historically people have wanted to own their own piece of land (eg. Attila the Hun, etc.) initially to keep livestock & grown crops etc. to keep their family. Having your own piece of land generally means building a dwelling on it to protect your investment, otherwise the livestock & crops will quickly go walkabout. Basically owning property is inbred into us from childhood.
As to renting a property. Renting is percieved as throwing money down the drain ie. what is better a) giving your money to your landlord or b) investing in a capital asset which, after a number of years, will be yours - very probably with a capital gain. Renting has it's minuses in as much as you never know when the landlord will decide to throw you out, or increase the rent, or demand that you maintain the structure of the property.
Socialism tried to solve the 'greedy landlord' problem with Council Housing - unfortunately someone had to pay for that idea (read: everyone), obviously through taxation. The problem with that was, if you couldn't pay your Council rent, so what?, the Authorities wouldn't throw you out on the street. Thus the end result turned out to be that the taxpayer was forced to 'subsidies' Council tenants through more taxes.