Allow me to politely disagree. Much of the attraction is in the event itself, not the display of wares (although it may not harm to have professional graphics...). 'Home-made' does not have to be totally bad, nor totally polished, I'd say. Certainly, some may be put off by really bad 'artwork', but if the only option is ordering five hundred (and having four fifty unsold...), it's worth a punt. It's worked for bands here in France; I know of several that 'brew' their own, and have done myself, on a very modest scale. And 'No, I don't think you'd like my 'artwork', either..!'