Sat down and read this whole thread in one sitting...
...and while space, money, and lost attention are all factors in the question of why so many women dislike fish-keeping... I'm thinking that one large factor has not really been discussed.
Fish, especially the type of fish that most of us keep, are feral. Fish are the axe-murderers of the pet industry.
Beat and kill their mates while breeding? Check.
Claim the entire house as there own, and kill everyone else in it? Check.
Eat the children? Check.
Fish are NOT cuddly. They do not like you. They do NOT want you to pet them. They do NOT want to jump in your lap. Heck, unless you feed them, they pretty much either ignore you, or attack you.
...and most wimmin just can't get attached to an axe-murderer.