This is going to sound judgy and it isn't meant to be, but here's my observations. I can understand why the OP is asking the question she is. 'Because I wanted to' isn't a REASON - it's summarising your decision, behind that will be a series of actual reasons why that person 'wanted to'.
That's what OP is asking, and I can see why - not surprisingly, people are very hesitant to give their actual reasons in case they get jumped on, so they just say 'I wanted to' or 'it worked for my family', so in a way the next logical question, if you're interested in the topic, is WHY did you want to or WHY did it work for your family. Just as you may respond 'But why did you particularly like the Ford Focus?' in response to 'I particularly liked the Ford Focus' on a car choice thread, for example.
Personally I think that Purplepoodle above is honest about a lot of the actual 'why':
Ff is easier, you can share the responsibility of feeding, your not tied to the baby, it often does help them to go through the night - in my experience, it's easier to ff in public than bf esp when you have other children, you know their exact in take, you don't have to worrying about mastitis, thrush, you can eat what you like
All of those are good reasons to FF which may really help during the newborn period. But they are all mother-centred. They help the mother (and father), and weighed against that is the fact that bf is better for the baby. Few people want to come out and say, I prioritised these kind of reasons above the consideration that breastmilk would be the best nutrition for the baby. It simply sounds like they put their needs above those of the baby and that would invite judging from others. Even though overall choosing FF for those reasons, in their opinion, would provide the optimum CARE LEVEL for their own baby in their own particular circumstances.
That is me trying to summarise with an impersonal tone, I've probably failed completely and will also get flamed.