"Sometimes I think some researchers think they're helping themselves keep their research proprietary so they will able to monetize their special knowledge or implementation, especially if no one else can make it work ("knowledge" (job) security/silo)."

My very limited experience says it is true. While our team worked for a commercial company in a certain highly competetive industry, I've both read many papers describing algos that on a closer look couldn't work as described and myself was forbidden to publish anything allowing our competitors or potential buyers to reproduce our algorithms. Our team ended up submitting a paper that was turned down by a reviewer and called an advertisement for the lack of details. None of us wanted to 'fix' that by adding fake details as in the papers we had read, so we ended up not publishing anything while working on the projects in that industry.