She moved to a "dead" server on purpose because there are several completely empty wards. She did this specifically to not bother other people and there is still a good number of empty wards available. She also said that she bought all the houses in that ward for the minimum possible price, which means that they were available for a long time before she bought (probably since 5.1). I think the real problem is people buying houses in big servers to sell them for real money or for a ridiculous amount of money (like 50M for a small plot). But all this could be solved with instanced housing.