You don't understand what I'm saying.That single Meta Alloy, as well as quite a few of their rares, are for unlocking Engineers.
The Meta Alloy is a bit of a relic though, as it's purchable at Darnielle's Progress in Maia. That's quite a trek though, so it may just be easier for people to buy 20 Imperial Slaves and trade them with EIC to get access to Felicity. No need to go down to Pleiades with EIC in your local neighbourhood.
I'm not saying that buying 1 meta alloy with 20 slaves is a bad deal. I'm saying that selling 1 meta alloy in exchange for 20 slave does't seem like a profitable deal at all.