Should Banks Dump Foreclosures On The Market, Or Trickle Them Out Slowly?

"Back in the 1980s when the S&L crisis hit [It doesn't look much like a crisis given today's situation, does it?] the RTC dumped a lot of homes on the market at once, and a lot of properties went very cheaply. Today lenders are keeping a lot of properties off of the market, apparently in the hope of avoiding a similar price meltdown."