Wikibooks doesn't reward the authors at all.  Wikibooks doesn't pay them money, it doesn't put their name on their work, and it doesn't let their contribution last forever -- others can go and muck it up with their editing.  (If anything I've said here is wrong, then let's say it's the perception of these problems that is the problem.)<p>Also, the current books aren't particularly good and the syntax for editing them is arcane.