To rent an average house in my area is about $2000 a month times 12 thats $24,000 will a house he's looking at fall another $24,000 probably not.
Your Number not mine if it happens an AVG $150,000 house at 5% $7500 at 10% $15,000
Look at the tax breaks of owning a house write off of mortgage interest and property taxes makes the amount saved even more.
I see losing a lot more than you are saving by waiting
Your misunderstanding is pretty common. Time Value of Money calculations involve exponential growth/decay, which is where most people's intuitive grasp of number breaks down.
Take your $150K property. To make calculations easier, we'll pretend you finance 100%. Buy today with a 30 year loan at 6.5%
At the end, you've paid over $340,000 for the property
Buy next year after a 5% drop in value, and that same property is purchased for $142.5K, and after all is done you'll pay about $324K. With your savings on the property added in, you could have paid over $24K in rent and still come out ahead.
Similarly (but magnified) if values drop 10%. Cost of property $135K, total payments $307K, and you could have spent almost $50K on rent for that one year and come out ahead of the deal.
You should also check with your tax adviser. Property tax is not written off. It is deducted from taxable income in most cases. The mortgage interest deduction is a wash, since you get that deduction in both scenarios.
Of course, these are just rough numbers with a simplified model, but the point is that, in many cases, a person will do better to hold off on a purchase decision when the market is going down.