Deciding that they are tired of traveling between Capsule Corp and Mount Paozu(sp... Sorry I am on my phone) and get their own place.

-finding out they want different styles of homes
-"but Goten, my mom will pay for everything."
-realtors being horrorified by the ways they need to test how durable their potential home is
-bonus but not required, in the end they end up sticking with their current situation.