They cost about 100 to 110 thou new, even back in 2010.
Someone, or some people decided it was time to sell off their Vipers, from the earliest, #61 (1992) that went for 43 thou.... to a '96, this 2010 and the 2002 Hennessey Venom, plus a 1300 mile 1997 that only went for 50 thou
http://www.barrett-jackson.com/Events/Event/Details/2015-DODGE-VIPER-GTS-181356
Even a '96 Shelby RT/10 one of 19 sold at only 52 thou http://www.barrett-jackson.com/Events/Event/Details/1996-DODGE-VIPER-RT/10-182128 and it only had 5 thousand miles.