DVC may be a good value for you though I'd be careful with the "deluxe" connotation. Depending on the property, DVC isn't exactly equivalent to a deluxe resort experience. (Some of the properly like Saratoga Springs feel more like a medium between mod and deluxe as opposed to true deluxe; studios are similar in size to deluxe hotel rooms but tend to have 1 bed + 1 "sleeper couch" as opposed to 2 real beds, and compared to a regular hotel room, you lose daily housekeeping. )
As discussed at length in another thread, I'd be careful looking at DVC as "savings." But if you know you want lots of regular
Disney vacations, it can be a good value, it can give you regular Disney trips to look forward to.
50 points will NOT get you far during President's week most years.
President's Week 2022, Saturday to Saturday:
Animal Kingdom Lodge, studio with Savannah view: 139 points
Bay Lake Tower, standard view studio: 139 points
Beach Club, standard view: 134 points
Boardwalk: 113 points standard view
Saratoga Springs, standard studio: 111 points.
So basically, 50 points can get about 3 nights during peak seasons, maybe 4 nights offpeak, in standard studios.
BUT.. If you only plan on using your points every 2-3 years, you can combine them, and regularly take 100 point trips.
Yes, you can use re-sale points at HHI, Vero Beach and Aulani. Though eligible at HHI, it can be difficult to book for summer during the available window (7 months). Outside of summer, you can easily use your points there.
There is virtually no benefit of adding a small "direct" contract to a resale contract, except that your "direct" points could be used at Riviera and future resorts. If you buy the minimum of 125 points direct, then you get blue card perks. Assuming it returns, the biggest blue card perk is a nicely discount annual pass. There are some other shopping and dining discounts associated with a blue card.
Something to keep in mind when buying re-sale of a small contract: You pay far more per point for lower point contracts.
For example, I just glanced and saw a SSR resale of 50 points listed at $138 per point, while a 150 point contract was listed at $108 per point.
So buying a 50 point contract.. and then another 75 point contract, will cost you significantly more than just buying a 125 point contract at once.