No, because the consumer won't walk away to find a better deal, they pay regardless. I can honestly see (note, not agree with) why some landlords charge so much.
I'm not sure the definition of capitalism includes an earnings cap...
The problem is you can't leave housing purely to market forces.
In a truly unregulated market, prices adjust until the majority of the market can be/has been profitably serviced. But in every market, not everybody will be able to afford to buy. Now that's fine when you're talking about a TV or a remote-control car or something non-essential.
When you're talking about shelter, food, heating, etc... you can't leave the supply of such things purely to market forces, unless you want a certain % to go homeless/ starve/ freeze to death. We now have things like the "winter fuel allowance" whereby the government pays a contribution to your heating. We also have government subsidising rents. Are such things the sign of a market that's able or willing to supply everyone according to their means? Heck, no. The market doesn't care if a certain % can't afford to heat their homes. The market only cares that enough are able to pay to turn a profit.
Capitalism isn't the solution to every situation. The fact that government has to intervene so often shows us that unrestrained capitalism would *never* work in our own best interests as a society. Without food safety regs, for instance, what do you think would end up in your food? A whole load of poisonous crap, no doubt. The markets would only care when enough people died that reputations were destroyed or profits suffered.
Housing is also not a great candidate for market forces to be left alone with, because the barrier for entry is so high that only a handful of developers can afford to build new stock these days, and the supply of land is very constrained. And we all know what would happen if there would no planning permission, don't we. Or building regs.
Why do we (collectively) worship at the alter of capitalism when it's very obvious capitalism in its pure form is extremely bad for almost everyone?
"That's capitalism!" Yes, and it's a very bad thing to think capitalism will solve problems if we just let it do its thing, and unburden it with govt "interference". We'd end back up in the Victorian era. Only have to look to history don't you. Because we had pretty unrestrained capitalism in this country before unions, workers rights, safety regs ever existed. Just look to the past...