The kind of market intelligence you're asking for is almost impossible to acquire.
The problem with your question is that the normal methods for measuring success, like box office figures, don't apply in the direct to DVD market.
As far as I know, there isn't a single market intelligence resource which tracks profits of individual direct to DVD titles. So, although it is easy to find out box office figures, because the cinema industry tracks and publishes them... direct to DVD isn't.
An additional complication is that deals in the film industry are struck on a territory by territory basis... so, a DVD that flops in the US market might be massive in the Far East.
Part of your problem here is you're trying to gather intelligence on global DVD sales from film makers who largely operate exclusively in the US market. For an international film maker this is probably a mistake, because you can't make judgments on how a Pakistani film will play in the American market by talking to Americans, but I've told you this before... so no point in going over the same old ground.
The other problem you're running into, is your assumption that film makers know about selling films... trust me, most of the film makers in any film forum have very limited knowledge of selling films (there are some exceptions)... but by and large film makers on the forums are largely film makers who are trying to figure out for themselves how to create their first big break into the market.
The mistake you are making is you assume that American film Makers know everything you need to know about the American film market... and yet, if I was to assume that you knew everything about the Pakistani film market and film industry and ask you a thousand questions about it... and then get upset when you didn't answer, I'd be kind of foolish wouldn't I?
So, Nadeel... what are the top ten grossing direct to DVD titles in Pakistan at the moment? Which are the three largest distribution companies for direct to DVD is Pakistan? What are the box office figures on the top ten grossing action movies to originate in Pakistan? .... Do you see my point yet? If you can't answer these questions off the top of your head, what makes you think American film makers can do that for their markets?