Recently, I was approached by a friend of my wife's, and she said that she and her husband were making a lot of money bidding on properties that went up for sale in our area, at auctions like this one, and then reselling them (without flipping or otherwise improving them).
I believe this is a "Tax Deed Sale" but I don't know much about it.
My wife and I have some money we've earmarked for making investments, but this sounds like a lot of reward, and I don't understand the risks. In my experience, risk and reward are directly related, so if there's a lot of money to be made, there's a lot of inherent risk involved.
I found a couple of books on the subject, but just the titles seem to indicate they're strongly for this type of investment and may not be the unbiased primer I'd want in order to understand them.
What kind of experience/knowledge should I have going into something like this? What are the risks involved in this type of sale, and how can I learn enough to know whether I'd be making a wise investment?