Why can't we just have unlimited housing?

[Azurymber]

Short answer: Server Space.
Long answer: SE doesn't want to admit they may have screwed up on housing and now its too late to fix the problem, so they keep adding more wards and areas hoping it will balance out but people still buy multiple.

That's the point. You figure out the costs of additional server space and use pay-for-use housing as a way to get the money to pay for it.