There are 1,440 plots per server, and you think only 20 would be cleared up initially? Depending on the inactivity duration details, I expect that number to be closer to 100-500 per server.

The MB near my FC house is the closest MB for 6 houses, the only people I ever see there are from my FC and a neighbor FC.

The MB near my main's house is the closest MB for 5 houses, I only ever see one other person there, and occasionally her bf who doesn't have a house in the area.

The MB near my alt's house is the closest MB for 9 houses, I only ever see people from 1 FC there.

I think they should have the grass start growing a little every week that a house isn't accessed by the owner, just so everyone can see how dead many of the districts are.