You will have access to the timeshare 1/52 weeks of the year. Let's make some simplifying (and fun!) assumptions:
- The seller works at cost: Owning 1/52 of a timeshare costs 1/52 as much as owning the whole thing.
- Uncle Sam really likes you and you don't pay tax on the timeshare.
- Price and maintenance is equally weighted: You pay 1/52 of the cost and 1/52 of the maintenance.
- Objective value of time is flat: A January week at a ski resort is equally valuable as a July week.
- Subjective value of time is flat: A week at a ski resort during your annual holiday is equally valuable as a week the day after HR at your work announces that crunch time just started and anyone taking time off in will be fired.
- Vacations never get old: A week of vacation in a place is equally valuable even when you do it the twentieth year in a row.
Given these, you can own the timeshare outright by buying every week separately. That would cost you 2.6M (!!!) and 52k/year in "maintenance" (!!!). This is a bit extreme for a 2BR. Let's say you research the area and find comparable apartments for sale at 2M with average maintenance cost of 30k/year. That means the base value for a week is 38.5k and 575/year. You are paying their company 11.5k up front and 425k every year to organize up to 51 other tenants. Do you think this service is that valuable? You decide.
That said, timeshares are typically a predatory business. They don't operate on the basis of providing 100x value, charging 105x for it, using 4x to cover expenses and keeping 1x as profit. They operate by charging 50x for 100x of apparent value, which turns out to be 10x actual value, and then the unwary customer ends up paying another 10x in fees to get out of the arrangement, after which the company spends 30x on the slimiest lawyer money can buy to deal with the inevitable lawsuits as they laugh all the way to the bank with the other 20x.
Also, let's say you are the median US age of 38 and have a life expectancy of 79. Let's say you will spend a week in this timeshare for each of your remaining 41 years. You will pay a total of 91k for the privilege, or 2.2k per week. That comes out to $315 per day. You can find a REALLY nice Airbnb for that kind of money - especially if you book early (just a few months early - not 40 years early!) - just a thought.