There’s a matter of distinction between commercial renting, and owners who use the product renting out some of their portfolio that they’re not using in any given year. The latter I believe is expressly permitted (exact language escaping me…), while the former is expressly prohibited (though I believe signs point to it happening anyway). There’s even a whole industry of commercial businesses like the board sponsor that make money from matchmaking & brokering rental transactions.
I was surprised when I ran breakeven calculations on different resale resorts, trying to justify a purchase on making back the purchase price and then enjoying the resort thereafter. It’s shorter than you’d think, even conservatively using the board sponsor’s rates instead of trying to rent privately for more.
If nothing else, the fact that you can legitimately rent out some points means finding a contract with double (banked) points can be like Magical Beginnings for resale. Maybe a double points SSR contract is $100 instead of $95, but if you rent out your “first year” points at $15-16 you’re reducing your all-in purchase price!