I see you lack any knowledge. It dont put pressure on servers. The people who "fooled" around moving plots are the ones who frankly caused the change to how housing works.
People would purposely move to a plot people want to troll them.
When the fix came in for lottery. The first one had same trolls getting plots then vacating them or hopping worlds putting them back into the lottery loop.
What has caused people not to fool around anymore is the fact the devs got smart and made it so if you won a plot and didn't take it, you lost half your gil.
Not to mention with everyone wanting mediums and larges. The sheer amount that would put in bids would lessen your chance.
The servers don't actually have issues unless someone ddos a world to crashing or if we close to a patch.
Otherwise, they are generally super quick on fixing stuff because we pay a sub.