We don't give away comp tickets in most circumstances.  For promotions or if the after prom wants a gift to give we will.  Otherwise, no comps.  And also usually only one, so they usually buy one ticket so they can go together.

Every actor deserves two, in my opinion. It's the least the theatre can do for the actor who put in many hours.

If you get into giving them out though, you end up giving away your only means of making money.  If our own theatre gave two to everyone who was in a show or worked on a show, we could easilly give away a full night's worth of tickets for each production.  Over the course of a year that could cut our revenue by over $16,000.  I agree it's the nice thing to do, but I also believe volunteers do so for the creative outlet, and not so much to get something tangible out of it. 

I have never heard of giving comps to people that audition.  We seat 135 and are in the process of moving where we will seat 230.  Each actor gets 1 comp.  If someone helps on the production; workday, lights, backstage etc. they also get one ticket.  Most of the time folks who donate items for the show will have their name under acknowledgements in the program.  The most anyone can receive is 2 comps.  We rent our space.

We don't give comps to actors and we don't call people that aren't cast.  People who have worked on the show in some capacity other than acting, directing or not on the running crew of the show are entitled to see the show for free.   Occasionally we'll comp on an as needed basis for items or services that have been donated.   With a 75 seat house we have to be judicious with our comps.   We have our own space with an arrangement from the town that includes an adult, childrens' and teen group.  It's a busy space.  We're not a rich group but we do ok.