You're right, the low and shoulder season travel really changes the value of the week. For many years I was tied to the kids school-schedule and would go to Palm Desert in summer. If I would have payed attention to the price (and availability) of Getaways, I would have learned pretty quickly that those weeks weren't worth the M.F. I was paying on them (to be trading them into the desert in summer of all times!). I am trying to utilize Getaways more often when I am travelling in the off-season and many weeks are an absolute bargain.
A lot of the math people do is also based on staying a 'top' week in the resort they bought, which there is nothing wrong with if that is their plan and how they use it. When I owned DVC, I always used it within their system (never trading out), so it was pretty clear cut when I looked at the numbers. However, for the 10+ years I have owned a Vistana lock-off, I have never once stayed there. It is only a 'vehicle' to get me somewhere else. That 'somewhere' is mostly resorts with M.F.'s that far exceed my little SDO.
It actually makes it difficult for me to find somewhere that I think is
worth it to own and occupy, as generally those properties I am attracted to are newer, more expensive to purchase and have higher maintenance fees (i.e. Marriott/Vistana Hawaii weeks, Hyatt, Four Seasons etc.). I find there is plenty of value using II, but can hardly make that part of a ROI scenario. I don't know how to calculate value on that, other than to look at the cost of the week I am trading, vs. the cost of the week I am trading into... which means it would be fluctuating year-to-year depending on what I traded into and what my fees were.
My experience is closer to that of
@Ken555, I can easily look at what my nightly rate is of what I own and it IS really that low. This year I calculated my costs to be $114 a night in a 2 bedroom (Hawaii being my most frequent destination). That is with considering an upcharge of $100 for the unit-size increase, trade fees and my II membership all-in. Plenty of people are still getting trades into Vistana and Marriott (or other Hawaii) without having priority as well -- they probably can even pay less per night as
@little1 posted.
I always buy something that I think I can at least give away on TUG at the end, and never actually pretend it's an asset. Works for me despite my math making a lousy-looking spreadsheet.