A GNB with LB, a WAR with LB, a SAM with LB and probably a BLM as well if the enemy is sleeping can do massive teamwipes. A NIN can chain kill as well if given the right situation.

Now, Ive seen actual cheating and nearly choked on a drink from laughing - a DNC used speedhacks and basically had perma zoomies that were faster than the speedlanes on Palaistra.

I won anyways because Blota and Salted Earth are a blessing.

Are they frequent? Perhaps more recently but I have rarely seen it happen on Light datacenter. I wont speak for NA datacenters though... *ehem*