<prompt> Human: Im hearing that banks are starting to offer IO mortgages again whether or not this is wise and if it will lead to another housing bubble is s separate discussion.For my purposes though, I see a potential opportunity here. Say I pay an extra 0.5 for a mortgage that doesnt require any principal repayment for the first 10 years. I live in the hours for 7 years, then sell it. In the mean time, Im investing the savings principal Im not repaying in index funds. Best case scenario the house appreciates enough in value that I dont have to bring any other money to closing when its time to sell the house. Worst case scenario there is no appreciation or theres depreciation, and the stock market goes down, and I have to sell from an already depleted stock portfolio to cover closing costs.Is this a reasonable bet? Im 27, so I have a long investing horizon. I also am not ready to buy a forever home yet, but I could see several scenarios where buying a home soon and holding it for 5-7 years would be better financially than continuing to rent.Thoughts?  <response>: Worst case scenario there is no appreciation or theres depreciation, and the stock market goes down, and I have to sell from an already depleted stock portfolio to cover closing costs. Worst case scenario is actually that no one will buy it out from under you, not even at a sizeable discount. 