If a family already had a set of higher order multiples due to fertility drugs (or not- it can happen naturally), but wanted to go back on them and get preggers again, would you think they were crazy? I would, and do.
On Discovery Health, there was a couple who had a single child from fertility drugs, and then quadruplets. They weren't happy, so they got pregnant again and had another set of quads (but one didn't survive).
I just could not wrap my head around that. In my humble opinion... the selfishness... oh my.
EDIT: They conceived again. Baby #10 is due sometime.
http://www.smh.com.au/news/National/Double-quads-Mum-conceives-10th-baby/2007/02/12/1171128844944.html http://www.bordermail.com.au/news/bm/national/655703.html The first article says that two of them are completely deaf, and the second says that they have no plans to stop at 10... crazy folks, I tell you!!