I haven't looked into that, but in my anecdotal experience the problems are: 1. There is simply less money in that line of work because it's tied to government

I haven't looked into that, but in my anecdotal experience the problems are: 1. There is simply less money in that line of work because it's tied to government grants. 2. The Physics field (which I have direct experience in) is dominated by old people with PhDs. They're very smart people, but also tend to be stubborn, and (again generalizing) are not too keen on listening to the opinions of people who don't have a PhD.