I do not know the person with 8k points. But I imagine it's different than renting out extra points through David's. I would assume this person created an LLC. The purchase price of points are depreciated every year as they lose value. This person then is also (likely) not being 1099-ed for rental income, but instead that is funneled into (likely) a home business. Perhaps a bedroom is being rented as an office to this business. And the person (likely sole owner) is being paid a salary, which means lower taxes.
So anyway, let's say this person bought points carefully. And "maybe" has had them for a while. Likely a LOT came from large and cheap resale contracts. So let's guess that the average cost per point per use is around $10 (amortized purchase price plus yearly MF). (My per point use with my SSR points is just a hair over $10 right now, but yes, I bought them cheap.) Let's say this person is renting them between $20 and $22. If they're able to snag some VGC or similar reservation, they can rent those as confirmed reservations for more. But let's average this at $21. Minus out the $10 per use value. That leaves an income of $88k for simply renting points, some of which income can be sheltered, from bedroom room rental, etc. And there you go--for a stay-at-home, part-time business, it's not bad. Plus at least some of your trips to Orlando can be viewed as a business expense.