What do you think about having a flower girl and ring bearer in a wedding?

I am getting married in May and I am undecided as to whether or not I should have a flower girl/ring bearer.The wedding is semi-formal and is going to be outside.It's going to be an adults wedding only as my fiance and I don't want children at the wedding.I know it's my fiance's and my decision,but I am having a tough time deciding.What do most of you think?Also, I already asked my friend's daughter if she would be my flower girl and she excepted the position,but now I am having second thoughts about the flower girl/ring bearer.Did most of you have flower girls/ring bearers? Also, If I decide not to have the flower girl,do you think it would hurt the little girl's feelings(and flower girl's mom, my friend)if I said we decided not to have a flower girl?She is 6.I am leaning towards not having the kids in the wedding, but I would have to pay for the dress/shoes/hair, the boys suit,etc and I don't have the money for this.I know I should of chkd my budget 1st b4 asking but didnt. TY!