OBVIOUSLY-you guys are in need of another WOMANS point of view
And it just so happens I have one (surprise, surprise)
First ask her two questions
Why does she hate the tank??
is it because you spend so much time on it ,it can't be a money thing since the bike is so much more. Oh god you don't have an EEL in it do you??? (perhaps some green m&ms, if so you're doomed)
then ask why she supports the bike--perhaps she's thinking this could be something you two can do together, which in her "chick" mind would be worth the cash.
Are you being supportive of her hobbies and interests, if not it's not right to expect the same in return.
Anyway yes indeed marriage is give and take, I highly recommend you find your common ground before getting hitched.
An example would be my husband dislikes my hobby because of the time I spend on it and this board, and also the money. I dislike his golfing every stupid weekend we have together, and blowing over a grand on new clubs while he's doing it, or replacing our 9 month old 400 dollar dvd player with a new 5 changer (that way he doesn't have to get off the couch to put in a new movie-nope just10-15hrs continous play)
We accept these things and never fight about them. Give and Take
BUT, it is also imperative you find some common activities otherwise you'll find yourself alone all the time with the stuff you love but without the person you love.
I'm rambling aren't I?
Sorry
Good Luck