To be honest, regardless of how much you're going to hate to read this, but SE is a company. A company's goal fist and foremost is to make money. If it doesn't make money, it ceases to be. That being said, the current system is far from perfect, but there are finite resources and current housing allows for almost limitless customization. Each house eats up a ton of space. You can't simply just make more wards unless you have the resources for it. SE could easily dumb down housing (remove building design, limit locations for furniture, limit rotations, etc.) like what Turbine did with LotRO and allow thousands of wards, but it would stifle creativity and the feeling of ownership.