Nobody wants to come online and work for a landlord. Sure there's potential profit sitting there on the table but capitalizing on that creates a model that eats itself to death.
Very similar to bidbots, the moment it becomes as successful as it possibly can is also the exact moment it fucks itself. With bidbots, sure a handful of people could buy votes leading to purchasing a slot for 'x' amount of time. If 1000 people all jumped in trying to get that top slot all at once, they'd buy two seconds worth of time to shine before someone else bumps them down, or someone buys a metric shit-ton meaning they're king of the castle but now there's no one to compete against because it's out of reach.