One of the most common misconceptions about Iron Condors I encounter is the notion that there is any difference between an Iron Condor and an ordinary condor or between iron butterflies and regular butterflies. They're really the same respective organisms, just with different skin color, if you'll pardon the metaphor cocktail. Obviously the iron condors and butterflies employ both puts and calls, whereas regular condors and butterflies use either calls or puts, but not both. Still, the risk profile of iron butterflies and condors is exactly the same as regular butterflies and condors, and thus there is absolutely no reason to prefer one type over the other, unless you can somehow spot a better deal on one than the other. If that were the case, and the difference were not negligible, you'd have an arbitrage opportunity: you could sell the more expensive spread, say it were the iron one, buy the regular spread, and capitalize off the difference with no risk. I'm not at all suggesting to go out and look for those opportunities, as the 8 leg trade would be prohibitively expensive to put on, most likely, and the probability of finding such an opportunity would be nil. The point in mentioning it is just to say that iron condors and butterflies are perfectly interchangeable with regular condors and butterflies and, if they weren't, there would be a risk-free profit available to the astute ornithologist or entomologist.
This seems, at first, somewhat implausible as the long iron spreads are put on for a credit, while the regular condors and butterflies are put on for a debit (assuming the middle strike is about ATM). While that is true, it will be clear by examining a risk graph that the maximum profit of the regular butterfly and condor is the same as the credit of a comparable iron butterfly and condor. Put another way, a trader is no more likely to be able to keep the initial credit of the iron b/c spreads than he is to earn the maximum profit on the regular b/c spreads. Furthermore, the breakeven points in the iron b/c and regular b/c are identical.
Seeing how many Google ads about iron spreads appear lining the right side of the monitor, and the fecundity of discussion about iron spreads heard on this and other boards, you begin to get the sense that the iron spreads are unique strategies, with benefits and risks that separate them from all other strategies, but that simply is not true. The same can be said about covered calls and naked puts: exactly the same strategy. Even the dividend earned on the underlier leg of a covered call is priced into the put (normally). Both strategies are alike in every conceivable way, yet traders insist on distinguishing between them.
I don't know, maybe traders think the word iron means they can't lose as much money. I know if I were putting my money on something as fragile and ephemeral as a butterfly, I'd want it to be made of iron too. Unfortunately, the reality is that one is no more ironclad than the other.