You should absolutely rescind, before it is too later.
*You can buy on the resale market for pennies on the dollar.
*Anyone can have a II Acct. - you don't have to buy from the developer.
*When you exchange through II - it isn't like booking a hotel. Exchanging is competitive - another owner has to deposit the resort/date you want, you have to beat other owners to it, and you have to have the trading power required. It takes some time to learn the system.
*Yes - there is a fee for exchanging - that's true with all exchange companies. That is how they make their money.
Rescind today, and then you can take your time, learn about the resale market, and make a decision that you feel comfortable with, with no pressure.