Ok then you REALLY have no right to be charging 70!! I did that and it was 30, I used my old barns horses and split the money with the owner. You have a lot to learn I am 17 as well and have been riding forever but would never even consider charging that much.
As mentioned it will bite you back once these people become more educated or start looking around you can and probably will get a bad name for charging out that wazoo......just saying if you want to keep doing this for a long time successfully please rethink your pricing and be more fair.
just a small town girl with a big town dream :]