Dude. I don't know what planet you are living in but a well located larger two bedroom apartment in a city like Novi Sad in Serbia or Timisiora in in Romania will set you back something 150,000 Euros. Let a lone a house for a family. 3 - 5% is the general benchmark level of yield for a diversified low risk portfolio of blue chip assets. If you start getting into the terriroty of higher yeilds there is usually either more risk involved or more headache involved.
Even for example in commercial property the lowest risk most blue chip property types will often sell on net rental yields of 4 or 5%. A warehouse in a prime location leased to Amazon on a 30 year lease or a data centre in a prime location leased to Google on a 30 year lease etc these types of properties with that quality level will often sell on net yields of 4 or 5%. when you start getting into the territory of 6%, 7%, 8% yields in commercial property there is often more risk involved. Same as dividends with stocks. In any bluechip city in a first world country you would be hard pressed to find a family home in a good location
which sells on a net rental yield of more than 4%
For example if you look in the U.S.A. S&P High yield Dividend Aristocrats ETF:
"The S&P High Yield Dividend Aristocrats® index is designed to measure the performance of companies within the S&P Composite 1500® that have followed a managed-dividends policy of consistently increasing dividends every year for at least 20 years." The current yield on this ETF is a about 3%.
By the way I am not saying yields of more than 4% are unattainable. I am just saying in the 3 - 5% ballpark is what is generally available to the passive investor with minimal headache involved and moderate levels of risk involved and moderate knowledge required etc. Anything much above 4% yield and you are generally getting into the territory of specialized knowledge, more time investment, more headache or more risk. I am trying to talk about a yield which is easily available to the average member of the general public.
You said "
There’s only two normal common ways to meet people: work or study." That is true for meeting people in general but its not true of searching for a traditional wife. In terms of studying we are all past high school age here and the type of woman who would be a traditional wife isn't going to go to university. Also the type of woman who would be a traditional wife is either not working or working in a non-serious job e.g. waitress, cashier etc. As a foreign man you are not going to work as a waiter or cashier in Romania or Serbia, etc. If you do some type of work there (.e.g. accountant, engineer, software programmer, etc) any women you meet through work will likely be career women rather than a traditional women.
Croatia? Are you kidding? Croatia is flooded with tourists so Croatian girls are going to give zero additional value to foreigners not to mention the insane levels of competition. Also cost of living is out of control in Croatia as most things are priced at tourist levels.