@bear_necessities Well, essentially the idea has always been pretty simple - run a PrP, get some XP (or other in-game bonuses).
Mind you, this is no silver bullet. Those have gotten abused in the past. The simplest way is by people who ran them only for their friends (i.e. the people they'd be doing it for anyway), and so if you didn't have access to plots before you probably wouldn't now either.
Another way reward systems misfired is when people ran unplotted scenes just to collect them. "A birthday party" kind of deal.
But even then at least something happens. In smaller MU* when nothing happens for long enough it can be a game-killing condition, since people get bored and leave, then when other players log on they find no one else on, get bored and leave, etc... until there's no one left.