Greedy people? You mean investors who probably worked hard to earn their money and are trying to provide a future for themselves and their family by investing in residential property? Maybe uninformed, unfortunate but I am not sure you should brand them all as greedy, particularly on a forum based solely on investing in property.
Also, owners don't pump up price, the market determines the price. The market being made up of willing buyers and willing sellers. It takes two to tango.
Not all people decided to kick out long term tenants and increase the rent....
All I can say is I hope it was worth it for those that did.