I got a Xindi doff, Muaza Amman'sor, and I didn't need it, so I went on the exchange to try and figure out how much it is worth. Problem was that none were for sale. The other Xindi doffs were going for over 87mil EC and I found a forum post of someone selling theirs for 150 mil EC.
I didn't want to overprice it, nor did I want to undercharge. I decided that a little lower than the other Xindi doffs, thus 80mil EC. Then I went to Earth Spacedock and DS9 and asked for a price check. All I got were joke answers like "price check on isle 3" or "check the exchange". Is this normal? Where do you get a price check on an item not being sold on the exchange? Is 80mil EC too much or not enough?
80 mil isn't that wrong... Here's what you need to consider:
Xindi Officers are extremely rare. As such the demand is significantly higher than then supply.
80 mil may sound like alot, but it really isn't. The most common Mk XII Very Rare consoles go for 5 mil, and you pretty much build those for free, so you can get alot of EC very fast. Basically inflation: The money is worth less than their appearent value.
So I'd say you have the right attitude... Sell for a little less than everyone else, and you are good.
I've been saving up some EC for a few days, selling contraband, random very rare doffs and powered alien artifacts. I'm up to 40mil, so I know it isn't hard to get the 80mil EC that I'm asking. Bought my D'kora a month ago for 67 mil.
But all that is buying and selling things I see on the exchange regularly. I was just surprised that no one in in-game chat was willing to help with the price check.
I'll know in a few days if I'm overcharging, but as you point out, there are so few on the market, that I think they'll just have to pay my price, or offer something reasonable. (like a recluse carrier, lol)
There aren't a lot of people who buy those DOffs, but the supply of them is also extremely small. Your price sounds about what I'd expect if not a bit low, but it may take a while to sell despite that.
Also check the price on Halor Kurlam - she's another DOff with the same power that came out of the Gamma Quadrant packs.