It doesn't have to be a losing proposition. Do what businesses do when their input costs rise - raise the rental price to keep your margins intact. Hotel costs have risen significantly over the last 4 years since the pandemic ended, so people renting from owners shouldn't expect to pay what they did in 2019. Raising the rental price to protect margins as maintenance fees go up is how a rational market should behave. If all owners follow a profit-based model, that's how it would work.
I acknowledge that, unfortunately, the owner-rental market is not alway a rational marketplace. Unlike for-profit businesses, some individual owners may set their prices artificially low just to recoup maintenance fees, not to make a profit. As result, the owner rental market tends to be under-priced, and doesn't always behave as a profit-based market would. So, the problem may not actually be the rising maintenance fees. The problem may be that the owner rental market is economically flawed, since it's not always a profit oriented marketplace. The bottom-feeders set the market price. To me, that seems like a market to steer away from as a business/seller.