As
@jellen613 alluded to, renting a week is how most people visit the shore from North Carolina up through Maine. And how many people stay at East Coast ski destinations.
I was basically pointing out that if you want to compare to your previous costs to work out "savings" - that's a personal comparison, so maybe / probably isn't that useful generically which was another point I edited out of my initial reply because I felt like it was just arguing "nah it isn't" to the point. I wanted to talk about how even with their suggested comparison, it's a flawed choice if you're going to discount the cash rate because of all the issues.
I think all of it is the problem - like many things in life, you have a bunch of legitimate ways to analyze it and the first part is figuring out which (maybe set of) way(s) makes sense for the person.
For my money, IF you're comparing renting a week somewhere other than a hotel, necessarily you're talking about either timeshare, AirBnB, VRBO, Vacasa or a traditional vacation house rental broker. I'd argue many of those comparisons make timeshare owned weeks look pretty good - especially if you don't need a full house. One of my co-workers rents whole houses for a week in the Outer Banks frequently, and they're like 8 BR houses, so he needs to get a lot of friend or acquaintance couples to share the room cost. The last one he did was $11,000 for the whole week. That per bedroom cost makes a lot of timeshare's MFs look pretty good IMO. I've said before that AirBnB is very hit or miss, sometimes it's a good price, often it isn't, especially with the extra fees and what still feels like higher risk to me than other options.
I'd argue the trickier issue is MFs vs RCI or II cash rates, but that's harder in a general sense because many places don't show up there at all, and of those, even more don't show up for desired weeks. If you're me who likes summer stuff and doesn't ski, Massanutten for instance always makes sense to do RCI cash rates and they're almost always something like $300 less than MFs.
This availability is also why I often discount "redweek or direct owner rental" - because it's often hard for me to even find availability. So hotel site cash rate might be there for resorts that there isn't a public rental average that's easy to find.