Should non-talk slides be included in the handout? I'm putting together a slideshow for an upcoming talk (I'm in a field where slideshows are slowly becoming common, and these colloquia are always good opportunities to get used to things like this). The talk itself only runs to slide 20 or so, but after that I'm going to have another 20-25 slides to help me deal with a number of questions that I anticipate might arise during Q&amp;A. I'm going to make a printout of the slideshow and distribute it as a handout. 

The question is, should I include the non-talk slides in the handout? The way I see it:

Pro:


helps audience members understand my answers to their questions.
provides a more detailed overview of certain areas where an efficient presentation requires simplification of the content.


Con


paper cost (ecologically, not financially): we are talking about 3-4 extra sheets of paper per handout.
people who are interested in the content of these slides will probably go and ask me for the paper instead; people who aren't interested in that level of detail will probably not even look at them.
I think that if you are going to prepare a handout, you might as well add all of the material in the handout, including your backup slides.  After all, you've put them in there for a reason, and since you might share them during the talk, you might as well share them in the handout as well.