We offer two (2) comps for all actors and crew.  Directors, musical directors and producers receive four (4) comps.  It's the least we can do after people spend so much time away from their families during rehearsals. 

Our intimate 60 seat theatre doesn't seem to be losing any revenue by offering this benefit.

We've never done it, but I think comps for cast members is a great idea.  We do occasionally give comps for free publicity or BIG favors for stuff loaned.  I am glad you posted this question. I think it is one of those things that you don't think about. 9 times out of 10 there are seats empty, especially opening night, and we could give a couple of tickets to the cast members for their families. We don't own our own building. We have to pay $250.00 rent per show plus 10% of our ticket sales for the space we use. The venue doesn't care if we give out comps, we just haven't ever done it.  

One of the nicest perks (besides comps) for the performers that didn't cost the CT a nickel was a thing called "Star Parking." 

The loading dock behind the theater was a "No Parking" Zone during the day, but at night-time the theater wouldn't be expecting deliveries so they would place all the performer's names in a hat and draw out two. 

Those lucky to have their names drawn were given official parking passes to place on their dashboards allowing them to park free behind the theater for that performance.  What a luxury it was to know beforehand one wouldn't have to scramble for parking -- or worse; pay in a lot.

Depending on the size of the cast, the permit was good for one night or one weekend of shows.  And if it was a particularly large cast, once a name had been drawn, it was not allowed back in the hat -- giving everybody a chance for at least one night of hassle-free parking.

THANKS so much to you all for posting replies.  Our board estimates conservatively that we lose over $1200 annually to free tix to cast members and crew.  As with all CTs, we struggle financially every day.  I'm directing "Beauty and the Beast" this season and we are already at our limit of comps for buying favors and props and advertising.  We auditioned over 110 folks for the cast, and up front we said "no comps" and there was only one squeak.  Hence, I bring up the topic...I know we give pity little else for everything the cast and crew do, but losing that revenue is difficult.  As jphcock said, family and friends of cast and crew comprise a significant portion of our paying audiences.  This is quite the quandry for us.  Additional thoughts would be most appreciated.

 I always get into strife from the committees, because I give out comps like a bloke with one arm.
For A Chorus Line we had over 400 auditions to fronted up, so I gave each one a single comp. Like what was practiced by PJ Barnum. I was admonished by everyone for doing so. But the season was almost sold out before we finished the audition process. Which got up the box office ladies nose & I believe I was vindicated.
With all cast & crew I give them a comp, rarely two comps. So as it becomes a safe bet they will want to bring a friend. Frankly we make more out of donations per head because of comps, than ever getting from a ticket price.
Of course they all get a free program, as we don?t sell them anyway, just give them a way.
With ?Stepping Out? each of the cast got $50, as a perdeim towards the cost of tap shoes, because there was only 2 who could or had tap danced before.