I don't understand why there needs to be conditions associated with friendships. Are we entering into a binding contract, party A agrees to provide language A, party B agrees to provide language B, and if either party defaults on the terms of the contract then what penalty will be imposed?
I love my language and I want others to understand why. The friends I have chosen will happily teach me their language if I saw a need but I am half dutch and never learned that language because I live in an English speaking country. My friends provide me with so much more than a language I will never use, they are interesting, their lives are interesting, their culture is interesting to me. Not only that but I enjoy their company and they enrich my life so much by just being in it.