There is skim if you convert to Abound points and book back into your home resort, but they don't have to elect their MM1 for points. Just use as a regular week and lockoff to book a week in a studio and 1BR back to back.
As far as skim goes, and how I heard it from Emmy (iconnections and Taffy19), if she booked her entire lockoff as back-to-back instead of the lockoff as one week, she can only book six nights in the studio.
There is a lot throwing around the term "skim", and people refer to it in different ways. This is how I internalized the term myself since this thing launched back in 2010...
There is skim if you Elect MVC Club Points. (period)... It really doesn't matter what you do with the points. The skim happens because the number of points you get is less than the
average points required to book the unit you own in the season you own. Since not all weeks in the season cost the same to book (unlike Vistana), the points you get may be enough for 5 nights during some of the weeks in the season you own or for 9 nights during other weeks but that's neither here nor there - even if you book 10 nights in your season with those points, you still got "skimmed" and it's not "reverse skim" as some called it in the early days. The skim is related to the fact that you got fewer points than the average needed to book a week in the season. It's not related to the number of nights you can book in your season.
Here is an example - At Newport Coast Villas the Platinum season runs from week 23-25 and 27-51 (basically 28 weeks from early June to Christmas, excluding 4th of July event week). 7 weeks in the season require 4225 points to book, another 7 weeks require 4725 points, and 14 of the weeks require only 2900 points.
The average for those 28 weeks is 3688 points. Owners get only 3475 points, which is a 6% shortfall from the average - hence 6% skim.
Platinum owners can always (try to) book their home resort during the Platinum season. They can also elect points and book 5 nights in July (less than ideal, unless you couldn't reserve your VOI as week), or 8 nights that include up to 2 weekend nights anytime between September 15 and Christmas. And of course they can try to use points at 80+ other resorts. But either way they incurred skim at the moment they elected points because they only had 3475 points to work with instead of 3688.
Note that even if they awarded owners 3688 points when they elected points, they still couldn't book 7 nights in 14 of the 28 weeks. But if they did award 3688, there would be no skim because the total "points out" equal the total "points in". Some here may still call it skim if they couldn't book
every week in the season, but I'm pretty sure it would not even be legal to give out any more points than that.
To me, that 5%-7% "skim" a transaction cost for electing Club Points. It doesn't exist in Vistana with Staroptions.