An incredible return on investment. I bet many ended up with higher wages, better health, better housing etc (though I think about 1/4 ended up returning, at a large expense)
From there you can easily extrapolate how much it deviated from contemporary wages (roughly 30,000 Austrian schillings a year for a Viennese industrial laborer with a union contract in 1964).
A lot of people who think they are from middle class backgrounds are actually in the upper cream of society but never realize it.
Here's economic data for wages and household income in Austria back in 1965 [0] (page 2 and 11).
[0] - https://www.oecd.org/content/dam/oecd/en/publications/report...
I'm curious about the passengers on the bus and doubt everyone went the full distance on it.