I'm not an MVC owner - the costs always scared me off every time. I was recently considering doing the resale week and trading via II, but it still sounds like there's lots of "junk fees" perhaps. Or maybe I'm misunderstanding Abound and being able to trade your week in II. I did get some close to free II traders that are independent, and that sometimes pull Marriott (though not premium weeks / locations), and also got getaways and have booked MVC in Orlando area 2x that way.
My take away is MVC are nicer resorts, but you really have to consider if the 2-4x cost (that I've seen vs independents or HGVC) is worth it. Also, II is very much like a slot machine, you just cannot KNOW in advance, before you own a resort, how it'll trade or what it'll pull. At least IME. II is significantly harder to book in for me than RCI, at least unless you're looking at Orlando, Branson, Las Vegas - the overbuilt areas. But the resorts in II are nicer. Someday I'll update my video on this to have an independent RCI account with points but the general idea is IMHO reasonable here:
So - keep that in mind. II is a lot more work, but can get you good trades, and I guess especially with identified MVC traders, though their buy in is pretty high.