Yes I know, your least-favorite idea goes here. But seriously, someone must have come up with the concept before. Like a bad get-rich-quick scheme could fall into this category, where joining the scheme makes people lose money and become more desperate, so they become more likely to do desperate things like invest more in the scheme. But it can apply to a number of other bad ideas.
I would usually refer to such a thing as a “Producers” (like the play) but that is specifically for bad ideas that suck for a majority of people but benefit a few; like the plot of the play where they make a flop to get more money than they would with a hit.