If you want a Scam to work the way it should, you need to be prepared as much as possible.
Create an Archer, spend some time lvling it, and get it to a nice Plvling status.
Become a Water Factory. Most people will RB Waters with supers and socs, so you will get awsome low-lvl gear, which could quite possibly have Rainbows as Soc Gems.
If you want nice High-lvl gear, Take the Char back before they RB it.
You can also Plvl any other class this way, which only takes a few days to get that Char to a nice Sell point, or just to a lvl to where someone else would rather not go through the trouble to obtain.
If your character is Deleted, Plvl another.