unless the company in question is publicly traded your not going to find much info on sales volume. thats often closely guarded info by non public stocked companies. makes it harder for the competition.
most optics companies dont sell direct but to wholesalers who then distribute to dealers. some companies offer direct sales off their webpages but usually at msrp.
i dont think there is a good way to line up the info your looking for
"Gun control: The theory that a woman found dead in an alley, raped and strangled with her panty hose, is somehow morally superior to a woman explaining to police how her attacker got that fatal bullet wound." — L. Neil Smith
The problem with being stupid is you cannot simply decide to stop doing dumb things...
"I crapped my pants to avoid the draft!!" -Ted Nugent