One of the major sources of bullshit jobs are self-annihilating professions, like lawyers or advertising. Monsanto sues Exxon for a billion dollars, Exxon countersues, they spend ten years in court and then settle for 10% of what they each spent on lawyers. Coke and Pepsi each spend a billion dollars on advertising to cancel each other out.

If people had more "disincentive to work" then getting people to work would require paying them more money. Jobs that self-cancel their own profession could then hire fewer people industry-wide and result in a net productivity boost, since whatever they do in the alternative can't be more useless than what they were doing.