Celebrim
Legend
So can a non-profit venture not be a success?
It's such a general question that I don't know that I can answer. "Non-profit" here is vaguely defined.
I hold that profit is a close synonym of the word "sustainability". Things that continue do continue because they are profitable and things that aren't profitable will inevitably cease. For example, life depends on profit. It produces more of itself, through things like offspring. If life ever ceased to produce a profit, it would inevitably disappear.
Frequently when discussing profit people ignore some of the profit or some of the costs in an effort to deceive or be self-deceived. So when you say "non-profit" I don't know what you mean by it. Does it not make more of itself? Or do you mean non-profit only in a narrow legal definition, where there are legal constraints on the sort of profit you can make (but non-profits can be very profitable for some of their participants, as for example PACs or vaguely defined endowments or trusts with very well-paid fund managers).
When discussing a game, were discussing something that usually depends on various material goods. I think it's fair then to think of the success of a game - it ability to produce more copies of itself - in terms of material profit. Money that doesn't produce more of itself invariably disappears. Now there are some "non-profit" game concepts like the OGL that were very successful, in that they produced more copies of themselves, but then the games and books derived from that "non-profit" concept where themselves grounded in profit.