Quoting Amelia Margaret:" I don't understand why people would do something that increases the chance of twins just for the sake of having twins. They're willing to increase the likelihood of a NICU stay just to be cute?"
This is my thought too.
The person who's blog I read.. she has ALWAYS wanted twins and always gone for more embryos for that reason..
Well she finally got them but it's just such a HUGE risk.
I know another women who had issues conceiving, always did two embryos and had a healthy daughter. Then got pregnant with twins.
From day one it was trouble, she gave birth before 30 weeks. One baby was stillborn and the other was so premature she was in hospital her entire life.. She made it to I think over a year but then died.. 3 or 4 weeks before her mom gave birth to another child who they'd conceived naturally.
For this reason alone I just wouldn't do it.