Why do adjectives financial research focus on analysing top 500 tabled companies just?
I am interested surrounded by becoming an...
ALL financial research? don't you mean "most"?
What's a devout conditional duty?
correct - "most" not "all".
Investors don't pay for research directly, but even if they did, it would be the same model:
Smaller companies own fewer investors and generally their shares trade smaller amount frequently.
If you are going to spend extensive amounts of time getting to know and following a company, you need to be able to "sell" your work to a full-size enough audience so that it is worth your time.
Research analysts tend to only cover "larger" companies, because here is enough interest in the stock. The research arm of a firm get paid via providing research, and then have the investor place trades through their firm.
So you can see why covering some small company wouldn't make any sense, because even if an investor loved your research and wanted to invest their money, it would be difficult for them to money you because of the size / illiquidity of the stock.