Five hundo
From my personal experience - I'm not a big breakfast eater, travel for work mainly who pay for everything, and have not received any special rooms for being diamond ... I value the 4 suite upgrades and 4 pm check out at about $500 all-in.
The main reason why is that there are few Hyatts where I want to vacation, and the ones that are in places are typically big convention hotels and not resorts. I also deduct a lot in my valuation because of the scarcity of Hyatts when traveling for business adds an inconvenience factor.
I love the hotels and love what they are doing. But I dropped from Diamond to platinum last year as I split time with SPG properties.
If I paid for my own travel or had a small business this equation might change slightly.