With the high cost of ferries and minimal accommodation on Mona's Isle, how about some subsidised trips and beds for the volunteers needed. There are a lot of fixed income guys and girls (OAP's) who find the TT more financially out of reach every year. We have the time and the sense of responsibility to do a good job and once trained would be a regular source of marshal material for several years, why not some short term contracts.
My personal experience is a 200% increase in cottage rental over a 3 year period, maybe it's time to reconsider the caravan ban just for the TT with limited travel restrictions.(By area), say Ronaldsway Airport).