I have experienced this – 9% “interest rate” can be risky.
Not to say you can’t do it but be aware of the risk.
When everyone thinks China’s property price can only go up, that’s risky.
It’s hard to call what’s the fair price – most of the time it can be “unfair” for some time and be well above what you think is fair.
Incorrect understanding of risk leads to irresponsible leverage, which might result in an “unfair” pullback.
Collectively, behaviors reinforce each other and the systematic risk is accumulated.
We have seen it in the US stock market, in the US housing market, in the Japan stock market, in the Japan housing market.
This the the first part – “No risk is risky”
The second part is harder.
When to call the reversal could be more art. How much more than “fair” is “fair”?
Nobody can tell you when enough is enough. You have to think independently and get to conclusion. It could be a very lonely journey. But if you make it right, congratulations, you earned yourself a great investor.
How to get to your conclusion? Get more unbiased info, be really reasonable and be patient. Just personal thinking, I am not good enough to give advice.