Most of my guests are staying 4 nights and that comes to almost $800 per person. Plus our airfare right now is about the same as you, almost $600 roundtrip. So people are spending nearly $1400 for 4 nights and airfare. I travel annually and stay at all inclusives, including many in the Cancun area and yes, this is a very normal price. What sucks is that airfare is expensive and I dont think it will really go lower (my travel agent told me to have everyone book as soon as the air comes out because that is when it is the lowest). Paying almost $200/night for all inclusive is an excellent rate. You have to make sure your guests know that it seems expensive up front but once they are there, the do not need to shell out another penny. And food, alcohol, activities, entertainment, etc. is all included! Hope that helps!