Despite warnings about their potential risks, mortgage borrowers don’t seem to have lost their appetite for interest-only mortgages. In fact, a new analysis reveals that IO loans currently account for a significant slice – nearly one-quarter – of the mortgage market pie. Inside Alternative Mortgages estimates that $317 billion in new interest-only loans, excluding option ARMs, were originated during the first half of the year – an amount equal to 22.2 percent of the… [One data table included]