Dear Miriel,
we are happy that you enjoyed the tour with us, what seams very strange to us that you say it is overpriced. If you would love to make a cheaper tour you should have taken a tour with 20 other people where they exactly planed where to go and how much time you spend on which place.
A prived tour with officel guides incluedes that you also can choose what you wish to know of Ibiza and that you can stay as long as you wish on a place where you want and that you will also visit spots where no other tourists ever have seen.
It is included the office guide, the transport, which is only for you and to your attention, as water, softdrinks and sparkling vine, cake, frute and other little snacks, as well as the booking commision we have to pay that you can book it.
If you honestly will calculat all this facts you would not conplain about the price for a privat tour. And like you said, you had a good time and no critic about the tour en general.