I don't think they're saying everything has to be for gain. But there is definitely the point about "who pays the price" – whether it's the opportunity cost of

I don't think they're saying everything has to be for gain. But there is definitely the point about "who pays the price" – whether it's the opportunity cost of lost income from working on caddy, or other price (time with family, friends, etc). I do agree with patio11 that it's easier to just have a real support contract. IMO, one of the model open source projects is Sidekiq. It's become a very sustainable business for its author.