I thought I'd squirrel some money away in case of a big ticket item like water heater, roof, etc. 

The pricing includes your stay and ticket to the conference. 

The upcoming week has several of the big-ticket reports that have strong track records of causing rate movement.

Houses are fetching a pretty penny, showing they’re still a hot ticket.- Market Pace: Houses are taking a bit longer to sell, with Days on Market up by 35.6 percent to 61 days.

For example, you could offer a special deal like, “Stay two nights in August and receive a s'mores package or tickets to a local restaurant or waterpark.”You might also think about donating a week to a previous guest or a family in need.

You keep the extra ticket cash. 

Other than that, not factoring in replacement costs, big ticket item expenses, and not having any reserves are some main ones that come up. 

Their "ticket" system is not functionaing well. 

Report each issue on a separate ticket (grass, trash, health hazards, etc).

If the tenants are not reporting maintenance tickets during the year then you should not worry about it, but if something comes up on your yearly inspection report then yes I would try to get it fixed.