I've come to the point where I don't really mind leeching, except when it's done unilaterally. That is, some goober will join a party where they are fully capable of contributing, say a level 90 character in Abyssea or a level 40 character in Crawler's Nest. Then, like 30 minutes into it, they just decide to AFK without notice. That just pisses me off. At least with Abyssea keying, the lower level guy is contributing a needed service, and with Fell-Cleave leeching there is a pre-existing agreement between the people attacking and the people leeching. Here it's just some guy who joins a party under the guise of being a contributing member and then deceives you.