For the same reason I do? Just to see what they Tweet? I'm not invested in BMXC either.
You have to remember, the person running @OWCPharma isn't the CEO himself either.
Sometimes it's just educational, informative, etc. to follow competition and other industry, non competition... Just to see what they're Tweeting. What the current buzz is about. Maybe get ideas for how to do their own Twitter management. Who knows.
Like I pointed out to the other guy after you... @OWCPharma also follows Merck, NFL players, Michael Phelps, and other OTC traded and NASDAQ traded companies. Doesn't mean they have ANY money invested or ever will.