With the next patch released, there is a change on the exchange for a Eudemon Crystal. You will get more power if your equipment has bonus or sockets:
Refined 10
Unique 40
Elite 200
Super 1800
each bonus 200
one socket 800
two sockets 2000
For example, if you have a Refined +2 Blade with two sockets, you will get a crystal with 2410 points (10+200×2+2000=2410).