Paying Bridesmaids hairstyles

When paying the bridesmaid hairstyles, there are no hard and fast rules to do so. If the Bride chooses the bridesmaid to wear their hair in a specific way to her liking or us her favorite salon, then it should be the Bride who pays. But if everyone is willing in using the same salon, with no hard feelings then why not divide the bill fairly.But the bridesmaids are free to do their very own hair