I'd like to keep the system as it is, but maybe have a "film review" system in place, where if you were filming at the time of the disco you could submit film and if it is a legit disco, you get perks refunded.
Some may say that this would take too much time for the HT staff, and perhaps it might...I don't know how many of those films would be sent in per day, but really how long would it take a staffer to watch ~10 seconds of pre disco film from a few people a week? If more than that submit, how about outsource the work to a trusted member of the community, who reviews the films and validates perk reimbursement. HTC could rotate this job for a month and pay that person's monthly fee. Seems pretty fair for volunteering to review a few films.