EE Revelation X Fair Value

Value is up to the buyer. People have wide variations in what they think is fair. That is true for both new and used items. When you sell a used item, remember that it may no longer be under warranty which, for some items, can be important. EE, for example, warrants its products only for the original buyer. Companies that offer repair services regardless of owner and/or use may have higher resale value (EE does not).

Time may be a factor as well. People will pay more for an item that they need soon for an upcoming trip, for example.

Auctions let the current market decide the value (although the current market can change quite a bit throughout the year). Or pick a price that you would like, and allow people to “Make an offer”.

Also consider the value to you as a “spare” that you can lend to friends/family/partners. If nothing else, it would probably be a nice comforter for you bed or sofa. :)

As a very loose rule of thumb, 50% of full list price is a starting point for used gear. Sales prices are rarely that low, so it gives the buyer some discount over the best possible purchase price, and also accounts for lack of warranty. However, you may very well find a buyer willing to pay more than that, especially for gear in excellent condition. Gear Swap and r/ULgeartrade often attract buyers willing to pay a premium for something that is hard to get from a manufacturer. Those communities tend to also take good care of their gear.

It also helps if you are not in a hurry to sell — ask for the price that you want and wait until you find the right buyer.

Finally, you might get a better answer by simply posting an ad.