I'm not entirely sure, but I know that they apprear to be great for buying RSgp. With a trade value of 33k, 10 can be bought for, say, 25$. These can then be junk-traded for 10M each. 100M * 2.20$ = 220$
They're becoming a brilliant currency, because of the low trade value, but high street price.
The disadvantage, obviousely, is the junk gathering, but fletchig can make that easily enough!
Regards,
Sail.