It is unhealthy group behaviour. Your actions reduces the groups access. By sharing you increase group access and group success. When you buy a property for

It is unhealthy group behaviour. Your actions reduces the groups access. By sharing you increase group access and group success. When you buy a property for speculation you take a risk on your ability to increase market value (or outside reasons). You could lose money. Hoarding group resources makes you a net negative in your group. Hoarding property alone means you had to create or borrow enough value to obtain the property and finance upkeep. Someone has the money to build a new home. That transaction is a net positive.