newbee:
If you are talking about the litvishe crowd, especially the “in-town” litvishe crowd, then you are somewhat correct. Of course, I also know countless frum men who are therapists, nurses, plumbers, electricians, diamond dealers (might be considered a business owner), etc… It definitely exists.
Amongst the chassidishe crowd, you are more likely to find those who do other things (driving trucks, etc…).