Is the marginal cost of providing a copy of software really $0, or does the marginal user ask questions, have feature requests, uncover bugs with new usage patterns, ...? Does that non-zero marginal cost vary with the features included in the software? Isn't support a major part of most software product differentiation strategies?
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That's true, and that's continuous labor. However, it's also possible for software to come with no support too (e.g. abandoned games). As software developers, we care that our labor is paid for, but there's no reason there should be some kind of eternal dividend for doing nothing. Nor should there be for bushiness people generally.
Which is why intellectual property rights are time-limited? One can make a strong argument those rights are protected for _too much_ time, and the length of that restriction can be attributed to regulatory capture. But the remedy is shorter copyright terms and patent exclusivity periods, or higher costs to maintain protections (like property taxes on real property), not abolition of intellectual property as a concept.