I just did a quick 30 minute check of what's been offered for sale here in Australia in the last 6-8 months on a popular hifi classifieds site vs current retail Australian prices:
Utopia - 2 for sale - average price 70% of retail
Clear - 1 for sale - average price 77% of retail
Elear - 2 for sale - average price 78% of retail
LCD4 - 1 for sale - average price 69% of retail
LCD3 - 2 for sale - average price 63% of retail
LCD2 - 6 for sale - average price 66% of retail
LCDX - 1 for sale - average price 71% of retail
HE1000 v2 - 1 for sale - average price 69% of retail
Admittedly small sample size and not very scientific, but surprisingly consistent between brands and models. No evidence that the Utopia loses it's value any more than any other hi-end brand. The really high end stuff (Utopia, LCD4 and Hifiman HE1000) are all selling second hand for about 70% of retail price. Could be different in other countries?