Failure to make mortgage payments can happen for a number of reasons including losing a job, medical issues, conflict due to a divorce, and mounting debt. When owners are unable or unwilling to pay the mortgage, upkeep usually suffers too. Routine maintenance and repairs might be skipped.
This neglect can leave a house in bad shape. It can range from stained carpet and an overgrown yard to severe roof leaks and broken windows. And once foreclosure proceedings start, the owner may abandon the home completely, or even intentionally cause damage.
All of these things can be fixed—at a cost. And that falls to the buyer. Homes in foreclosure are typically sold as-is. The price of repairing or replacing the things can add up quickly, making the low asking price less enticing.
For the right buyer, the house may still be worth it. If the repairs needed are within the buyer's budget, or if the home has other desirable features, such as a sought-after neighborhood, the pros may outweigh the cons.
Another thing to consider is that where they once stood firm about selling homes as-is, banks may be changing their stance on repairs. As the market has improved, most banks do not have as many foreclosed properties in their inventory as they did a decade ago. They may be less desperate to recoup their losses and more willing to negotiate on making improvements if it can get them a better price.