I just don't want all my work to be open and free and to live from services (technical support or customizations), just because there is not the same money from that, so in the end I will have to look for a job.

All the developers that make their source code public will take the job and the bread from the hand of other developers.
For example: If Office is free, the developers of Quick Office, WordPerfect, even the MS Office will have to find another job.

For humanity's progress I love Open Source, like I would love no patents. But in todays world even the human genes (made by nature) are patented.
Now, the question is, the companies that researched and found that gene usage, can they get the money back from all that investment in research? The same with the code, if it is not closed and everybody has access to its source, will be the same interest for the companies to produce that code?