Instead, give them a portable hole that goes to a Githyanki pawn shop, they get cursed coin, and the Githyanki get items for their war effort.
Occasionally, a Mind Flayer or Githzerai hit squad shows up to kill the party, since object reading points to them as "suppliers" of the Githyanki. It's a win win for everyone...except the dead PCs...
Oh wait, when you say "my group", do you mean you are the DM or part of the party? If number 2, ignore everything I said in the preceding two paragraphs. Um, what's the name of your DM?
chuckle