It makes sense that an incompatible donor/recipient pair would enter a KPD Program, but why should a compatible pair consider joining?
The more pairs who are in the pool, the better the chances for finding exchanges. This is why many compatible donor/recipient pairs are encouraged to join a kidney paired donation program. In exchange for participating, there is a search for a “better” kidney for the recipient. This could be a better tissue(s) match, a donor who is younger than their compatible donor, and/or a donor who is closer in size to the recipient. Some compatible pairs choose to join for altruistic reasons. They understand when a swap is performed it not only helps them, but also helps someone else to receive a transplant. In most cases, if no better pairing is found in a reasonable amount of time, the compatible pair is scheduled for their surgeries with one another.