My questions are... Can you use DVC on the Disney Adventures and/or cruises?
Yes...IF you purchase direct.
But the questions I would ask are
a) why would you buy ANYbody's "adventures" rather than planning and booking your own -- tailored to your own interests (rather than a groups) at a fraction of the cost. And if you were comsumed by "adventuritis," why on earth would you choose a
Disney adventure when there are legendary companies out there who have been doing this for generations?
b) Same with cruises. Do a quick Google search for cruises and see what the real world prices are for cruises. Then compare those prices to
DCL. Then look at the DVC
points costs of a cruise. That should cure you.
What are the pros and cons to going through Disney or through a resale company?
The pros of purchasing directly from Disney are quickness and certainty. The downside is that you'll pay somewhere between 10%-100% more than you would pay resale.
The other perceived benefit of buying direct is you get the use of the "collections" and DCL. But that's not guaranteed, and it could be taken away from you with the stroke of a pen. And it's of dubious value on its best day.
The benefit of purchasing resale is large savings with minimal restrictions that you probably wouldn't use anyway. The downside is the process takes some time (I'd plan on up to 8 weeks from offer to ready to make reservations). And there is a tiny bit of uncertainty. A couple of years ago, DVC used to ROFR (right of first refusal) a reasonable number of contracts, meaning they bought it instead of the purchaser. That's not true any more, but with resale, it ain't over until it's over.
Also, I think with resale the quality of the sellers has deteriorated a GREAT deal in the last couple of years. IMHO, a LOT of people who shouldn't have bought DVC did, and they're no better as sellers than they were as buyers.
Would we have to purchase a huge amount of points for the 6 of us to go together?
Well...you'd need AT LEAST a two bedroom, and given the ages and sexes of the IL's, I'd say you'd need somewhat more than that. Figure out the sleeping/bathroom configuration you'd need and you'll have your answer. Six people -- including a 16 y/o young lady and a 13 y/o boy -- is not an easy, simple lodging choice.