Publishing is done for profit, and it is done for the love of the material being published, and it is done for a mixture of the two. From my point of view, if a publication clearly is at least part a "labour of love" then I would be willing to consider making contributions to it without hope of financial rewards. I would expect, however, that:
1) it would be clear that there were others, including the principals of the operation, who were making similar contributions; and
2) the decision to make such a contribution is one to be made by me, voluntarily and in advance - people who don't pay bills they have previously agreed to pay do not attract any sympathy from me.