I see your argument if you are rich in points. But if you are buying Hyatt gift cards, resellers often make them available for >10% discounts.
Then again, your travel habits are different than mine, as I do not accumulate points through business travel. In my dozen or so stays this past year at Hyatts, my aggregate points accumulated has been 48. I book the rooms much cheaper on non-matching third-party websites and don't typically spend money at the property.