Undercutting by 1g is just childish... I can see that they're just trying to keep theirs at the top of the board but when things don't sell very often it means my incidental items never sell. I'll usually check the history and put an item up for what it seemed to sell for in the past. If someone keeps 1g undercutting me I start lowering the price by about 2% each time. Usually others will follow suit, adjusting a bit, so mine is never so low as to be attractive for resale. If they match my price, even if their listing is above mine due to Retainer name, I don't undercut at all.

The fact is that I am the worst monster when it comes to the board.

Have you ever bought out an item that was confirmed for Fashion Report to put it up for over ten times its original price? Then someone puts 3-5 of them up all weekend, adding more when they sell, and regularly undercutting by 5-10% until they're selling for near what you paid.
Perhaps you found something people like for glamour that uses very cheap mats and listed it for nearly one-hundred times what it cost you? One day ten of them are listed for half what you're charging, driving the price down, with more following until your price looks ridiculous compared to the sale history.
Or perhaps even buying vendor items and listing them for double or triple their cost? It seems good until they start being listed for vendor price plus market tax and an additional 1000g.

That's what I do.

I see people in this thread complaining about listings being under the regular price, that it annoys them, and it annoys me just as much to see listings trying to take advantage of situations to charge way more than the item is really worth or previously sold for. I attempt to correct this. It's not completely altruistic: seeing prices shift and change over the course of time, desperately squeezing as much profit as possible from the situation, while I make steady returns is pretty funny.