.org does not have a limited usage. Conduct a search you will soon realize that many companies around the world "for profit" use dot org now. .org is being used by many private foreign companies too and they cleverly indicate on their sites some of their earnings will benefit charity.
With all these tlds like .web .click .inc .llc .lol .smile coming to the market .org will be one of the ones that won't be lost in the chatter and will be holding on to its position. It conveys a MSG of trust and prestige.