Some people find renting their points to be a real hassle. They get renters who need a lot of handholding, or don't pay on time, or want to switch. They sift through hundreds of responses to their "points for rent" posts responding to people who want a bargain above and beyond what they are willing to give. Sometimes they show up here with wails of "never again." Very occationally, they end up holding the bag - and the bag is empty.
Other people have it down to a fairly simple science. Sometimes they share what they do here to make it work in an effective manner.
Then there are others, they ENJOY the process of renting points, helping someone else create a magical vacation - if they are covering their costs, the effort itself is a labor of love - or at least an enjoyable hobby.
Financially, it isn't a good investment in money/time - at least not at the going rate here. You'll break even, but there are better uses for your money and time. But if you have extra points to rent....
Personally, I'd be more likely to suppliment the points I own by renting points from others and transferring them into my account than own more points than I generally need. But to me, any hassle in renting points is too much hassle. However, when we "overvacation" for our points, we pay cash at the CRO resorts, revisiting old favorites, and that has worked very well for us.