There is a difference in-between foster dogs and what you want to do. You can't really compare Apples and Oranges but I will do my best.

The main reason is that people who foster animals of any kind do it because it is in the best interest of the animal. The animal is in need of a home and without a foster home who knows what might happen to it. However, you are taking on this rabbit for a few months, you have purchased it from a breeder and if you did not purchase it the rabbit might have a chance at a forever home. You are doing what is in the best intrest of you. I have no doubt this rabbit would be loved and well cared for, but if left with the breeder it could have a good chance of getting a forever home.
Example: It would be like adopting a pure-bred Sheltie, keeping it for a few months, showing it and then giving it up for adoption again. The poor dog got attached and then is just uprooted. I use this example because some people (not saying you do!) believe that rabbits don't have emotions, that they don't get attached and that they are nothing like dogs as far as feelings go, which isn't true at all. Both my rabbits are very attached to me and know the difference between me and my family members.

Also, I believe that if you plan to take on an animal it should be a life time commitment, no matter what.

Anyways! That’s all I will say on this subject in this thread, if you want to talk more you can PM me, the only reason I say this is because I do want to keep this a happy thread.

Ashley