I have to admit I'm struggling a bit to follow this. How do you know the MF for the future? Are you taking into account the taxes you had to pay on your rental income? I think you're coming in a bit low on the true cost of ownership here, but I'm not criticizing.
I figure my total price (so far) for my DVC timeshare is the amount I paid for the points, plus the total amount I've paid for maintenance fees so far (since 2010). Then I deduct from my total cost the amount I've received for rentals. (For example, say I paid $20,000 for points + $15,000 in MF since my purchase =$35,000. Deduct rental income, of $18,000, and my total cost so far would be $17,000)
Then I divide that by the number of years I've owned. (So $17,000 divided by 15=$1,133), That gives cost per year on average.
I then divide that by the total number of points I have, to give my cost per point averaged over the length of ownership. ($1,133 divided by 320 = $3.55)
I checked my logic with a couple of CPAs, and they approved it. Or maybe they just wanted to get rid of me and my timeshare gobbledygook.
That being said, if I use more points and stop renting out, and figure that MF will of course keep going up, my cost will also keep going up.
I'm not saying I'm right. I'm just doing the best I can LOL. Is there another way to figure that is more correct?
UPDATE: I've been thinking about it all night. It occurred to me that if I hadn't done any rentals for income, if I just took the cost of the TS and amortized it over the years I own, and then added in the MF, that would be more realistic. So, for example, if I paid $30,000 and owned for 15 years, that would be $2000 per year. Divide by number of points, 320, and that comes to $6.25. Add $10 MF per point to that, and it is $16.25 per point. (However, in my case I would deduct the rental income from the purchase cost, and amortize that amount.)