How about this...

Instead of spending time spamming purchase on an empty plot competing against other players who are doing the same, why not... do a literal LOTTERY? As in, if a player wants to buy the house, he'll register himself and be put on a random real lottery, to which if he'd be the winner, he'd get the house?

I managed to get an FC house myself yesterday, but it was absolute hell.

Making it so that it's an actual lottery will save players from pain.