The Bay Area's infamously high housing prices might be responsible for recent increases in the number of residences listed for sale. "We see more and more equity from price gains entice (homeowners) to sell their homes and reap those gains," said Ralph McLaughlin, chief economist for residential real estate site Trulia. In the third-quarter in the San Jose metro area, median listing prices for homes in the bottom, middle and top-third of the market were $631,000, $946,000 and $1.85 million, respectively.…