I might need that one day... Usually I don't print anything (have been living without a printer for 6 years now), but maybe, just maybe, I'll be in a situation where I must print something. Then I can at least go to a place where they have internet and printer, and ask for a favor since I won't waste their dead trees.
Services like this are important imho; those that fill in the "little" needs, because the "smaller" the need the more people are likely to have it.