Comment by 0xbadcafebee

It wouldn't really work because BM is a highly dynamic system with multiple variables that resists simple solutions.

  - The site conditions and trends of the day changes amount of moop per year
  - Some people dump their trash on other people's campsites
  - Wind carries moop onto campsites that already cleaned
  - Complaints about "unfair" deposit revocation would cause strife in the community
  - 10k attendees make <$50k/yr but must pay full price; doubling the price is a huge burden, even if temporary
  - Everybody already cleans as much as they're willing to clean
  - Rich people will all moop if they think they can pay to be exempted.
    They don't mind being banned because the event doesn't matter to them, it's just a party
  - There aren't many people who can/will stay for weeks after the burn, even if you paid them
  - The risk of increased moop increases risk that the event becomes banned

So basically it would result in more moop, would make people angry, would make it harder for poor people to attend, and would risk the status of the burn. Current system is working, no need to introduce additional downsides.