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Oh yeah completely, all the affordability tests clearly have a purpose. I only picked up on the other bit as I often hear people run the same argument you did about lower prices actually being better as the next property up is cheaper, etc but I think it always ignores that homeowners need low ltv for things to be cheap / easy - so the impact is felt more widely than just those who are in or close to negative equity
Yeah I just don't see much reason to suspect investors have more of a capital gain that can be soaked up than owner occupiers - probably less as they may have interest only mortgages, professional investors will have gearing targets, and investment horizons are probably shorter than how long it is between home moves.
I take your point on no negative equity but it's not just that - it's anything that pushes your LTV to a bad level that makes price drops a problem. You don't have to be underwater to find going from 75% ltv to 95% sucks