To be honest, I dont think they would do anything extraordinary because they know the rooms will fill (if not by us, by someone else). Its like Kadina, we rent half the hotel each time we go and they've never done us a special deal. Having said that, barter with them though, because I got mine cheaper. Note, the prices on the hotel website are cheaper than what they say on the phone.
It might not be the way you planned Steve but we've essentially accomplished the same thing - all staying at the one place!