Those who own a house can have our budget changed by things outside of our control. If my neighbor builds a mansion that makes my house more valueable and thus worth more and so I have to pay more taxes - nothing has changed about my house though. This means I have less money in my budget to do my own remodeling, go on vacation or whatever.
... okay? Join the rest of us? Do you think that doesn't happen to people who don't own homes? The only difference is that we don't own the property, and thus we not only pay more, but we have no equity gain from it in addition.