On a Related Note, What is the Limit?

I was thinking about this in relation to the dress post so I thought I would go ahead and post this as well.

It doesn't seem there is a definitive answer to this question but I would love to hear your feedback. What is the limit on how much your bridesmaid's should be expected to spend? Between parties, transportation, hotels, dresses, etc. there is a lot of cha-ching that goes into being a bridesmaid. Although I have personally only been a bridesmaid twice I know first hand how things can add up.

I was really concerned about this because I wanted to ask my bridesmaids to do a dress shopping weekend. Unfortunately none of us live in the same state, I was thinking about hosting it at my parent's house in Minneapolis since that would mean a free place to stay and one bridesmaid would not have to travel. Then I felt that was asking a lot, they will already have to purchase plane tickets for the actual wedding. I am planning on paying for their hair and makeup for the day if they would like it (but it is not being forced by any means).

It just seems difficult to pick a dress without having them all there to try them on, I was thinking of hosting a brunch for them and making it a fun weekend. Maybe even doing a bachelorette party type of thing so there wouldn't be additional travel for that. I don't want anything outlandish and I don't need a bridal shower. I am just so afraid of asking too much. I know one of my friendships is now strained because the bride asked way too much and never seemed appreciative. That is the last thing I want to happen.

I was also trying to find a dress for everyone under $150 because there would still be shoes and alterations to consider. However, it seems I haven't had all that much luck and the dresses I like are closer to the $200 range.

What do you think is reasonable and what do you think is too much?