Think about it this way.
Your plan is to buy a set points to use. You also plan to buy another set of points that you will use to generate an income stream. That's just an investment---the fact that it happens to be an investment in a
DVC rental doesn't matter. It's just an investment. If you look carefully, I think you will find that in most cases the investment return on "buying DVC points to rent" is not much better than you'd get if you just plowed the purchase price for the "second set" of points into a broad stock index fund, and paid your dues out of that.
And the index fund is a lot less work.
That's not an accident. The significant presence of renters tends to set the market price of points at a number that is neither too high nor too low compared to other investment alternatives. There are ways to get outsized returns on
DVC rentals, but it requires a little more than just buy-hold-rent. Instead, you'd need to buy-strip-flip.
Notice how many fully-stripped contracts are on the various broker sites to see how prevalent this is.