[TinGull]

I'm not aware of the differences in writing them...just aware of the differences between Euro style and american style as far as expirations and things go. isoroi, as far as implied volatility...thats the name of the game when you're selling options. If you sell something that has no volatility...then there's nothing to decay, really. You want something that has the premium pumped up SO much that there's little else for it to do other than dwindle away.

Say you sold a spread with very little IV, you could actually lose money on the options even if the underlying was to go in your favor. Thats because the IV is getting pumped into your options, making you lose money on the ones you sold, while you gain a minor amount in the ones you bought against the sold ones.

I hope that makes sense....let me know if you've got other questions.