If someone buys or makes something like this just to send a letter, they a) put in more human effort than writing it themselves, and b) are probably interesting and would benefit your community.
As I've already said in my direct reply, there's still the various costs involved in posting the letter, and if the community is based on a particular geographical area e.g. "Connacht Hill Farmer's Association", then it would raise eyebrows if the envelope had a Kazakhstani stamp on it.