First off, there is no such thing as an overall industry standard when it comes to the operations of a bar or club. There is no such thing as the elusive "Industry Courtesy".
With that out of the way, let me explain something that shouldn't be needed to be said.
You work at a bar or club and you decide to go out. You walk up past the line of people waiting and ask the doorman if the club does "Industry Courtesy". If you have to ask, the answer is more than likely, No. Obviously you don't know the doorstaff and they don't know you.
You order drinks from a waitress or bartender. After hearing how much your drinks are you ask if there is an "Industry Courtesy" price because you work in the industry. No, there isn't and if you don't tip your a tight ass broke piece of crap. Maybe you should work in a different industry.
There are so many people that work in this industry that think they should get preferential treatment. They get the job just so they can say they work somewhere and feel important. It's actually pretty dismal when people brag about where they work and then don't tip or treat the people working like crap because they've never heard of you or the place you work at. Get over it. Your a nobody just like everyone else, even me.
On the rare occasion that I do go out, I don't ask for anything. I figure there's no reason to. If someone recognizes me and decides to hook me up then I'll take care of them. Taking care of them entails tipping them and treating them like a normal person.
So here comes the fun part. I work industry so I know people survive on tips. If they discount my drink then it doesn't mean I tip less.
Let's say I order a $7 drink. I should normally tip about $2 on a $7 drink. The bartender recognizes me and gives me the drink for $3. Well, I'm already expecting to pay $7 so they just made a $4 tip. Seem outlandish? The outlandish thing to me is how some people think they deserve that $4 price cut without having to tip anything. Hey asshole, remember that when the bartender comes to your bar and he doesn't tip you well either.
You give and it returns. When you tip accordingly, whether you get hooked up or not, it will come back to you. Some day that bartender might show up at your bar. You hook them up and they'll hook you up. Maybe you need that extra cash that night, maybe you don't. Just remember them.
Getting to know other establishments is always a good thing. Depending on what position you hold will depend on the amount of good things. When your the doorman you get recognized almost immediately when you go to places. Especially if the employees from that place come to yours. Get in good with the doorstaff and things happen much faster. Sometimes the doorstaff will ask the bartenders to comp out a few drinks and that opens the lines of communication for the bartender.
Basically, when you ask for an "Industry Courtesy" your admitting to being a douche. You probably just got your job or your oblivious to how annoying that question is. Just because you work in the industry doesn't mean your any more special then the guy who works in a bicycle shop. Use a little tact, act human and talk to people. In most cases it works out better for everyone.