The fee for our church was €350 and on top of that we paid our priest and the sacristan. We gave the sacristan €50 and the priest €200. So €600 all in. On top of that we had the flowers and music so maybe €1,000 for the entire church part of the day. Compared to what we spent in the hotel, it was a fraction of the cost for what is the most important part of the day for most people.
OP - your fee seems high, €700 for the church alone. Does that include flowers maybe? Some churches don't allow you to bring your own.