I don't have a job. I offer a service to clients. I get paid when they use my software.
If they created their own software, they would not have to pay me any money. So without money, I have to go on welfare.
You get my point?
No, I don't want any of my clients to get access to my source code. I am not a giant corporation like redhat, google, oracle or other company that open sources it's software and then sells support or other services.
I'm a small company, who with more clients. Is hoping to them employ a small workforce and grow the company.