kip Ireman

Am I wrong in thinking that at 1 time buying linden mainland in auction was the cheapest way to buy land.. For example a 512 plot would cost you 512 L$ but I have noticed for a while now that land sales people are selling land at an extremely low price e.g 512 for 100L$ and so on. Obviously they are still making a profit at such low prices so where exactly do they get the land from so cheaply seeing as buying it in linden auction would cost far much more than they are selling it for ?