That's an easy one -- because they don't have to :-)
In some cases, "paying extra" without being asked to might even be compromising your fiduciary duties.
I feel the open source movement has spoilt its "user base" a little. There's very little expectation of reciprocity. Sometimes even outright hostility toward OSS modes that try work with reciprocity (check out the linked HN thread above).
This mindset might be hard to reverse at this point. As with all "communal sharing" experiments, the true crunch time comes as the economic reality sets in.
In some cases, "paying extra" without being asked to might even be compromising your fiduciary duties.
I feel the open source movement has spoilt its "user base" a little. There's very little expectation of reciprocity. Sometimes even outright hostility toward OSS modes that try work with reciprocity (check out the linked HN thread above).
This mindset might be hard to reverse at this point. As with all "communal sharing" experiments, the true crunch time comes as the economic reality sets in.