I've reported abusers in the past. These were people that I considered abusive, not some bitchouse of law. And no, i was not offered anything for this, other than suspicious looks, but since i cannot dispose of every child-hater myself, i see nothing wrong in using the DOLs {errr... LEOs} to bring them down.
However, if the innitiative was coming from the BOL {errr... LEA}, rather than from myself, then i'd certainly get my ears up, and sniff for anything that stinks. We all know the games they play, and as someone here already said: if they need me to bust someone, i bet it's not because of my great operative skills, but rather because the person is of my kind, and not an actual abuser.
In such a case, i would feign cooperation, and try to figure out for myself whether the person i'm sent after is an actual abuser or an innocent childlover. In the latter case, and if he's cought, i'll speak in his favor in court. In the former case {wich is unlikely, since in the former case they'd hardly need me, but still possible} i would report and get myself some "points" in the process.