Hi Dubshelley, bit late on this but anyways.
My understanding is that service charges are only payable by the members of the Management Company. You only become a member when you purchase your unit.
The developer is personally responsible for meeting all costs in relation to his unsold units i.e. insurance, maintenance, refuse costs etc. These costs should not be paid by the members of the Management Company.
Why do you think the fees will come down next year? Refuse costs, block insurance, management fees etc... will all increase as more units become members of the Management Company. I expect they will increase on a pro rata basis give or take... I appreciate that some fees i.e. Company Registration Fees will stay the same but I think the major costs will increase as there are more units to manage / maintain.