You do know that Devcoin is something mainly used on the test network correct?
I would advice you to exchange it for a more usable coin and then place a sale offer.
Been trading devcoin for 2 years.Today its trade volume on vircurex.com was 153.41 BTC, (the highest by volume).
Current market capitalization of devcoins -> $ 7,575,379. Ranked, currently at 13 th position by coinmarketcap.com.