I remember way back in the 'dark ages' (4.84, possibly earlier) when codename weapons were only worth one or two million.... for the *really* good ones.
These days the prices are crazy, 10 mill for a codename that is obviously less than wonderful and is basically only bought because it is;
a) a codename, even if it's rubbish (as in 'look! I have a codename!')
b) has a 'pretty' fire effect.
I sold a pair of codename a while back, mostly because I'm too used to the fast projectile speed of 'normal' weapons and I sort of needed the extra credits. From memory they, were Jades, I think, can't remember how much I sold them for, around the 20 mill mark for the pair, I think.
Those were the last codies I've actually owned, I haven't bothered with them since.