How would we know, other than reports?
They maximize their revenue when they maximize MFs. It sure seems like that has happened in the past few years.
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You would know by carefully reviewing the budget statements and talking to the resort management team about specifics, as well as observing resort operations and benchmarking against available indicies for the specific cost types. Its no different than any other area of business where there are budget submissions and you have to review and scrutinise them prior to approval.
I've seen lots of inuendo and supposition, such as yours, that leads to an unsupported assumption. There will always be lapses errors and ineptitude, that is just life, but isn't an indicator of any system wide cause, other than MVW have issues recruiting talent like everyone else. I've also see resorts taking a lowest cost at any cost approach to maint fees and watched the quality of the resort deteriorate accordingly and then a struggle to get it back to standard over many years.
I am certain that there is a pressure from MVW to maximise/optimise their revenues, they are a US listed corporate after all, and that will, as a minimum, have an impact subliminally on the management team. My experience of working in large global corporations is that there is often also a greater "loyalty" to the local customers than to the corporate mothership, and that is the balance our (yes they are ours, we pay for them) management teams have to make.
I have also seen MVC table budgets with line items that the BoD declined to approve, and the removal of items that are discretionary, which again is another normal business practice. We've seen BoDs drop the cost of access to adjacent Marriott hotels, as it can run to $100/week and reductions in towel change-over/daily clean etc etc. MVC GMs will be very sensitive to reductions that have an impact on Guest Satisfaction Index, so things will come and go as they test what does and doesn't influence that. I've also seen reports of "glory" projects funded or facilities being considered to be over specified, such as kitchen appliances being more expensive than they could be, fancy lighting or big TV screens. That may be where some of the opportunity to overbudget lies, but then I also see people complaining about things not being good enough.
I've not seen any specific, substantive, supported, evidence that there is system wide padding of maint fees in MVW's favour. If it is there then people need to be paying attention to their budget statements and asking questions more than they are now.