It does get old. Not fully sure why players do this but have a few guesses. Maybe bored, maybe they think all gathers are bots or they just don't want you to have the node so there is less to sell on there market. I have been in areas near nodes that have FATEs that some one will pull something from the FATE to the node and knock everyone off with aoe damage. Everyone leaves unhappy but if you check the person you may find they are a high level gether also or that the next group coming by the node is not harrassed. They stopped their competion until the node pops again. Once everyone has left, the person doing this switches to gathering and hits the node. It keeps supply low on the MB and their prices higher. Don't waste your time saying anything to the person, send harrassment/cheating report(depending on what you think the intent was), date, time, node, FATE method to knock you off, ect.